Hello,
With a 3.5gpa and 30 on mcats... I am very surprised you didn't get into anywhere. Like other people said... did you apply to top schools only? Did you apply to like 10 schools?
I know bunch of peepz from harvard, yale undergrad who was really cocky and applied to like 7 MD schools, got rejected and went to St. George in the caribbean for school. Sad huh ? They didnt want to wait a year.
Also, apply to DO schools as well, though be careful though, it is looked down upon by most DO interviewers if they know you apply to both MDs and DOs. Plus... you have to make sure you want to be a DO just incase, because if you don't, sometimes.. the interviewer can sniff you out. I know some friends of how who got really high gpa, Mcats, applied to same DO school I go to and got rejected. I know other interviewers who got rejected when we interviewed together even though their stats were much higher than my.
About interviews.... all I can say is.. be humble. I know interviews are about you, but sometimes, people get carried away and self expression change from enthusiastic to cocky and arrogant.
Anyhow.. GOodluck with your application. I hope you get into schools of your choice. Also, pick up BARONS med school guide. It tells you the stats on every school, MD, DO, dental. They give you % from instate, minority, expenses, mcats, gpa, etc.
So if you're not a minority, don't apply to a minority school... most likely.. you won't get in.