I was always into dirt bikes and never had any serious injuries until I was well into my thirties. I highly recommend riding dirt bikes to develop your skills.
I got this TT 500 when I was 17:
I did a few things to it and got it licensed. This was in 1981. It was a lot of fun, but I crashed on it a lot. Crashing on the street really sucks for many obvious reasons. I kept it for a number of years. It handled great on the street, but it was easy to overcook it in corners since it was underpowered. I got pretty good at doing power wheelies (I could never master the balance point.) and pitching the rear end through corners. It was a pig in the dirt.
A few noteworthy incidents:
There's a hairpin on 9 below the upper junction with 236. Going uphill, you could go off the pavement and use the shale on the hillside as a big banked turn. One day the bars swapped at the bottom, and the bike spit me out into the street. I was lucky there wasn't a car there. It wasn't fun riding home with my torn jacket sleeve flapping in the breeze against the road rash on my elbow.
I looped it out one day clicking into 5th gear. That was painful and expensive.
There was an uphill hairpin in Redwood Estates with a big fir tree on the inside. It's roots had encroached into the pavement. If you squared off the corner on the outside, you could hit the root and catch air - big fun! Until one day there was a bunch of loose gravel on the edge of the pavement that I hit. The front end washed out. In my disbelief, I neglected to stick my foot out and just lowsided. It dragged my foot along the pavement taking the tongue out of my Nikes and some skin along with it.
A few weeks later, I had just left my house, and there were a number of people hanging out in a nearby turnout. I figured I would show off and hot dog it around this right-hand corner. I forgot that it helps to have warm tires. The rear end came around at about 50mph. I new I was fucked and just leaned it over until it lowsided. I was sliding down the road on my ass, and steered my way into a culvert. Miraculously, I didn't get hurt. The bike was laying in the middle of the road going thump, thump, thump still running with the rear wheel spinning around off the ground. I looked myself over and noticed that my jacket sleeve was torn, and that seemed to be the extent of it. The people in the turnout started running my way so I waved may arms and yelled, "I'm okay!" The only damage to the bike was both brake levers were ground down. I went home and then found out the rear pocket of my jeans was missing along with my wallet. I went back to the scene, and found my wallet laying in the culvert. All the money and credit cards had been ground through. My wallet literally saved my ass.
I then figured this bike would eventually kill me so I decided to sell it to a buddy for $500. I think that was around 1985. (I'm kicking myself now.)
I started riding on the street again about twenty years later. A friend let me borrow his CBR900RR for a ride down the coast to LA. It was a blast. I had to get one of these. I ended up buying an '02 VFR800. It was an okay bike - somewhat mediocre, but it was a decent sport-tourer.
One day I was driving home from my job at Stanford going up 84 because the traffic on 280 sucked. When I got up to Skyline, there was a semi with Ducati emblazoned on it parked in front of Alice's. They were loading a bunch of Hyperstradas into it. Of course I had to stop and check it out. The guy told me if I showed up the next day with my gear and M1 license, I could take one for a spin. Who could resist? So the next day, I took one for a ride and decided I needed to sell my shitty Honda.
Ducatis are amazing machines.
A friend once showed up at a house I was renting in Los Gatos. This was in the early '90s. He was on an '88 851 Superbike. He asked me if I wanted to try it out. It was a hot summer day. I was wearing shorts and flip flops. I grabbed my helmet and hopped on it. It bugged me how the bars didn't turn very far. It was a bitch turning it around in the driveway. I took it for a spin around Vasona. As I was cruising down University Ave next to the lake, I looked down at the speedometer and noticed I was effortlessly doing 130mph. This was somewhat unnerving so I decide to slow down. I got on the freeway to head back home. It's a clover leaf. Coming out of the corner and getting onto the freeway, I was already doing 100mph before I got under the bridge. I wasn't used to this. it's really incredible how these things get going so fast so fast.
I ended up buying a 2012 Multistrada with the Öhlins suspension. This bike is a lot of fun. I got pitched on it a little bit yesterday on the way up Old San Jose/Soquel in some wet stuff on the road. It was pretty uneventful. Whenever it gets loose, (either end) it always comes right back. It's amazing how far you can lean it into corners.
I haven't crashed on the street in over thirty-five years. (Knock on wood!) One thing I've learned to do is ride smoothly and maintain lots of distance between myself and others on the road. That helps give me time to react to all of the idiocy. Every now and then, I feel the effects of the high and it gets the better of me. Drive fast and take chances. So far, I've been pretty lucky. I've never raced on pavement. I ride with guys who are much faster and skillful than I am.
Motorcycling is dangerous. I might die on my bike, but that wouldn't be a bad way to go if it happens quickly.
Everyone should know their own limitations and act accordingly. Good luck with your decision.