I agree with Beth Venus.

If you are unhappy and you do not see the relationship going anywhere it is better for you to break up.

You are both very young and will probably both change a lot over the next few years. Even without all the problems you already have it is possible these changes would have come between you anyway.

I don’t doubt that if you do break up your girlfriend will take it hard. However she deserves to be in a functional relationship with someone. If that’s not you, then it isn’t fair to stay.

If you can, encourage her to get help.