I just turned 18 I never had a real boyfriend cause I was never allowed to see people they disapprove of dating and stuff, m arabian my parent sent me here (u.s) to get into med school and become a doctor they always wanted me to focus on nothing but books and career and forget about living life. The whole time since June I been away from them in university I fell in love with sum1 and it's a long distance relationship. Now we want to get married and I can't tell my parents cause m afraid they'll tell me not to see him again and focus on your work or you are too young or even worst you can't be with him cause he is not of your race.. I love him and I don't want anyone but him.. what should I do?

If you have never had a real boyfriend who is this new long distance boyfriend, have you actually meet in person, were are they from.

First of course no matter what your culture, you are in the US and at 18 can do what you want without your parents permission.
But I believe you need to slow down, and actually date and get to know this person more

By all means, slow this mating process down and socialize more. It is similar to buying the first car you test drive; what do you compare it to?

Your all in love for the first time, and instead of making sure of both your feelings, you want to marry him? That's not to smart, as your love will be proven in time and actions, not just in intense feelings. Get your education, and if this love stands the test of time, then you can make a decision. Right now your just jumping at the first fish that jumps out of the pond. What's important is your education, so you can feed yourself, just in case you find out he is a bum. Be smart and love yourself enough to realise what important.