I don't want to burden my gf with my problems
Why do you not want to talk to her?
Actually I do not want to lose her and ruin our wonderful moments.
If you're in a relationship with her you should be willing to share your problems with her. Being open with your problems is how you make a healthy relationship.
She's very busy and I don't want to bother her.
You are not going to bother her, she should want to listen to your problems. Staying silent when you are struggling is not good!