Should I go to my eye doctor appointment on the 13th?

4 years ago I went to the eye doctor and I had 20/ 20. I have a hard time seeing the board at school. When I can’t see most signs until I’m right there on top of them. I get headaches all the time. I made the appt but then I’m starting to think they are just going to tell me I have 20 20 again so going will be a waste of time and money.

ps: I am a female that is 19 years old. Also when I put on my dad’s glasses I can see out of them once my eyes focus. I can see well out of them but then when I take them off I can’t see my eyes have to focus again.