Graduating from College at 20: What should I do next with my life?

I feel very unclear with my future once I graduate this summer with my bachelors in Management and International Business. I was born in the US but I did my high school in Peru. I graduated from high school over there when I was 16. Right after that I came back to the US and started to go to Miami Dade College and got my ociate in Arts for Business when I was 18. Next, I transferred to the school of business of Florida International University and enrolled into this 18 month accelerated program that I have been taking since then and now that I'm 19, and turning 20 in a few months, I'm going to graduate with my bachelor's. I really don't know what to do after that. I feel that doing a masters right now is not the way to go. I was thinking in doing a second degree computer science but it is something I don't know if I should do right now... I currently work full time in a retail store in the afternoon, after going to school in the mornings. I feel a little miserable because I think I made a bad decision in studying too much at such an early point of my life whereas I could've had join college clubs and made friends. Now I feel that I'm getting this degree but I have no one to hang out with or do something.... I haven't gone out in years and I really don't know what to do at this point. I can't even go out drinking legally! I was thinking last week that I should maybe study to get a licence to become a customs broker and import goods from abroad for US companies.... I have no clue whatsoever in what should I do... Should I lose 20 pounds and get fit?? travel around??? I don't know LOL .... any help???