I am sorry that you are going through such a painful time.
It is extremely difficult to have someone we love so much decide
that they want to end the relationship.
Is there someone you can talk to about this in order to have support in getting through it...maybe a counselor at your college or a supportive person at your church.
Just about the only thing that you can do is to respect her wishes
and let her go. In fact, you have a better chance of winning her
back by backing away from pursuing her and giving her more space.
Don't argue with her or try to control her, don't beg her or tell
her how much you need her and love her. You have already done all
that. Don't call her every day and want to see her. Instead, you
need to back off and let go. If she loves you enough, she will
call you and want to see you. Wait for her to say that she loves
you and wants to continue the relationship. If she doesn't then you
must be strong enough to let her go and move on with your life.
No one can force or persuade another person to keep loving them if
the other person has decided differently.
If the relationship ends, you will go through a very painful time
for a year or more possibly, but eventually, you will feel better
and find someone new to love, someone who has no barriers to loving
you back. The main thing is to promise yourself that you will never
get involved with another woman who has some barrier that might interfere with her loving you.