i was like 132 pounds or something when i started so i dont have the same genetic potential as others. I think at least 3/4 of the way yes.
You are not 3/4 of the way. When I started I was 5' 10.5" and 100lbs. I hit 260lbs by the end of my junior your in college and was still at 12% BF. (then, as I gained more it seemed I was less and less lean.

mostly diet related)
There is no way for you to know what you genetic potential is. I can say that there are times, sometimes a year or longer, where it seems like results are not happening. Then something clicks and everything starts going well again.
And lets face it, you don't even have enough experience to make any type of judgment like that anyhow.
Another thing I have noticed about guys who start using drugs at a young age is that they give up learning better ways to train. They just drug more when they want larger gains and forget that there is a lot that can be improved on their training.
So, back to the experience thing, you do not have enough experience to have found ways of training that will further increase your gains. There are a ton of training applications that should be explored before you start using drugs at 18. What worked in the past will not necessarily work in the future.
And now a story:
In college I had a training partner who was one of the most drugged up guys I have ever met. As a freshman, I was all ready to get on the program and start seeing the gains I wanted. (probably like yourself. I was 19)
My training partner said that the biggest mistake he made was going on drugs at such a young age. (16) He told me to wait until I hit my natural peak. (around 25 years of age)
So I did not go on drugs. When I was in my mid 20's I was still making gains, so I decided not to use drugs then too. After that I made some of my biggest gains in my late 20's.
No that I am in my 30's I still see no reason to use drugs. Gains are still being made and there seems to be no reason to add drugs into my life.
The point being that there is a lot that can happen in the next 12 years for you. Which brings me to -
I dont want to train for 10 years and be 30 years old when i reech the level of body that i want
Don't kid yourself. You are going to train 10 years before you get what you want. Even more motivating, you will not be where you want at that point either. That is the nature of training. Once you reach a certain level, you'll want to hit the next level.
So drugs or no, you will be training the next 10 years, at least, to get what you want. That is part of the joy of training, there is always more you can do.
Even then, your goals may change in the next 3 or 4 years, you might find something you think is totally cool to train for and change everything. It is not unheard of.
(I have gone from Olympic weightlifting, to powerlifting, to strongman, to Highland Games in the past 10 years)
I will not step off the soapbox. Just take a close look at how things work in real life before you make any major supplementation decisions.