Well check with her over this and confirm it, then make a decision ... make sure you really know how she feels ... don't listen to any "second hand" news from your mates about this.
I know it can be hard so make sure you get out and see your mates to help take your mind off it if she says no for sure. There is nothing wrong with some good diversions like sport etc to ease the pain.
Your number 1 priority is your wellbeing and getting to know who you really are as a person mate ... not studies ... not what other people think ... and not girls ... or just about anything you see on TV.
Remember that and you will be able to move forward in life.
Don't buy into the whole guys are tough thing either ... love is tough ... life is tough ... sometimes things will knock your emotions for a six.
Finding someone who you can talk with about this will also help ... maybe your school counsellor?
I hope some of this helps ... yeah, I do know what I am talking about.