You have to be a top TOP student to enter Harvard
The average GPA standards for Harvard is at the least a 3.9. Most students who get in have a GPA of 4.0. It also depends on how well you do on your SATs. Most scores are ranged between 2300 to 2400(the full score).
Also, you have to have done extra-curricular activities, such as being the president of your class, being in band, doing community service, you have to STAND OUT. Show them that you're not average or just a regular person, otherwise they will not accept you. I'm not trying to scare you or make it seem impossible but there extremely picky.
Have you taken AP classes? (Advance placement?) are you in the top 10% or in the top 5 students?
I'm in the top 10%, have done extra curricular activities and taken many AP classes but even so, I'm not 'good enough' my GPA is a 3.8 and my SAT score was a 2100. I haven't applied to their university because I know I would be blown away fast.