You have nothing to worry about. My final GPA was somewhere in the unenviable 3.1 range, and for no good reason. When asked, I told my interviewers explicitly that it was because I never did shit like withdraw from courses I was doing poorly in, take mickey mouse classes to boost my GPA, take harder courses at community college, or any of the other fun and games I saw other people play at.
I have only gotten into one school so far (and been rejected by at least 8 ), but if I can get in with my garbage GPA, your 3.5 shouldn't hold you back.