How do you feel about everyone in high school only thinking that I was smart because I was good at bullshitting?
Why is it that you felt the need to bluff?
I am not good at studying and everyone is better than me
You are not being honest with yourself or anyone else by letting everyone think that you are getting better grades. It would be best to study hard and get better grades legitimately.
It's hard to study and I hurt myself when I study.
People will be upset when you tell them that you've lied, but you need to be honest with those around you. Why mislead everyone? One day they'll find out anyways, it is better that it comes directly from you.