Am I smart enough for Pre-Med/Dental reqs? ***PLEASE ANSWER!!!

Hi, I am a potential pre-med/dental student, but I want to know, how does one know they have the aptitude to score well in these college pre-reqs? I have a 3.75 gpa in high school, along with the toughest classes a student can possibly take at my school, along with 3 varsity sports.I have scored 93+ in my math and science courses in high school, but is that enough? I know that my gpa is low, but is it high enough to handle these tough courses are college?