First off, fuck you're doin great for 18. Second don't let people tell you, you have to go to college. I did nothing but waste time in school and eventually dropped out to surf instead. At least you have a great knowledge of marketing things and are doing that instead. Some people just aren't made or meant to be students in school. I have more books on coding and marketing then anyone I know. I study constantly. Can I sit in a class do listen to lectures and do homework that doesn't pay me anything other then learning, nope. That shit just isn't for me.
I'd rather teach myself how to code doing something that has a financial reward rather then just a peice of paper. I'm not say don't got to college by any means. I'm just saying different people learn in different ways. Some of the smart most successful people I know couldn't handle school. Usually because it moves slow and they want to give a "well rounded" education which a lot of people that know what they want don't care about.
Follow your own path, stay focused, keep growing and learning no matter what you do and you'll always end up where you want.