Will I not be able to go to Six Flags?

I'm going to Six Flags Magic Mountain next Friday for my 15th birthday with my dad, his girlfriend, and my boyfriend. We just bought the tickets online but it said that you have to have a photo I.D. if you're not a small child. I'm worried because I don't have a school I.D. and my dad hasn't gotten me a new passport since I was like 7, I don't look the same anymore, so that wouldn't work. Can I get in if my parents are with me? Or do I just not get to go at all? If I don't have an I.D., how can I get one by July 9th? Thanks. I'm currently 14 by the way.