I would tell myself to take seated classes for at least the first year of college until you get comfortable with the college curriculmn. I would also tell myself tonot be nervous about adjusting to college life because being iin college is nothing like being in highschool. The students there are attending college for the same reason you are and all the drama and petty things students worry about in highschool are not even thought about in college. I would also tell myself to apply for as many scholarships as possible that way paying for tution is not such a problem. The last thing I would tell myself is that you should go to college becuase you want to be there not becaue your parents are forcing you to go and to major in a carrer that makes you happy. Also make sure you are prepared to put in the work for the classes becuase although socially college is eaiser than highshcool, education wise college is much harder and college does not have room for people who do not want to put in the effort to do their work.
I would tell myself that your past doesn't define your future. Take a step out on faith & continue your education. You have to do what's in your best interest & not fall prey to peer pressure.