You're ahead of where I was at your age. I walked on to an ACC school, but it would have been wiser to go to any school where I would have gotten playing time my first couple years. It doesn't matter if you go to a top 20 D1 school or not, not in the long run. Not if your goal is playing professional baseball. Bust your ass in the classroom and on the field, develop your body and mind to the absolute fullest and see what happens.
I didn't play my first 2 years of college (barely), but I stacked up a 4.0 GPA, put on 25-30 lbs of solid weight and improved my velocity by 5 miles per hour over just that short amount of time.
You're projectable, you could probably find a spot and a mid major D1 somewhere on the east coast right now (a delaware or a towson or a george mason type school). Get to consistent 90-92 mph and you'll find your way onto a larger school's roster or be the front line guy on a mid major staff.
But don't deceive yourself that any of this is about "odds." It's not. It's what you make it.
To anyone looking in from the outside, the chance that an 83-85 mph lefty from a small private school ends up walking on to Maryland and getting drafted throwing (sidearm) 90-95 mph is almost nonexistent. Even I had subconscious limitations in my mind where I believed for a time that maybe I am only capable of being an 87-89 mph lefty specialist, maybe I just don't have the talent or genetics to throw any harder than that. Fuck that, fuck the odds and fuck limitations.
If you have true desire to not just get better, not just play college ball, not just make a D1 team, but to truly be the best that you can possibly be, then you have a chance at something special.
If you just show up to practice, work on some stuff during catch play, do everything the rest of the guys on your team do, lift with the same intensity as everyone else, eat the same way as everyone else, focus the same way as everyone else, study as hard as everyone else, party as much as everyone else guess what?
You're going to get the same fucking result as everyone else.
I get shit from a lot of the teams that I'm on for doing things a little differently - lifting not just heavier but harder ("why are you going heavy? you're going to hurt yourself?" - as I get stronger every year), eating healthier ("why are you bringing a blender and protein powder on road trips? That's weird" As they scarf down fast food), Resisting the urge to bar hop with the team all the time ("how come you never drink in-season?" -as they show up the day of their start hungover).
My point being that you need to go all out in every area of your performance and your life. Maximize yourself as a person and an athlete. Be the best pitcher, student, and human being you possibly can be. And when you begin to evolve you will no longer feel the pull to follow others, and you will see the times where it's okay and where you have to break away and do what is best for you. Because if you do everything exactly as everyone else does, you will get the same results everyone else does.
If you want specifics on achieving some of these goals, send me an email or a PM