dude, Don't ya worry about that. You would be fine until your visa supports your duration of study. The best thing you can do now is to talk to your international advisor about it. Well if you return to NEPAL within your visa duration, then you don't have a problem. After your visa duration, you just need to show your I-20 and letter from your international advisor mentioning that you are studying over there in community college. They should let ya enter U.S.