Hey Scared,
Other people will get on here soon and tell you that you need to get to the dentist or an ENT (ear, nose, throat doctor) as soon as possible -- like today even. There are a lot of things that look like oral cancer, but aren't. I pray you have one of those. But even as I'm praying, I'm warning you:
Your dentist will probably think that it CAN'T be cancer because you are so young. It can be. My son was 21 when he was diagnosed. He had never smoked and rarely drank, and that made his doctor even more sure it couldn't be cancer. Two months went by with my son's regular doctor prescribing this and that before the day he could feel the tumor.
So get to the dentist. Listen to what he/she has to say. If they say it is not cancer -- GREAT!! But if it's still there after two weeks, go back, or make an appointment with an ENT and insist on a biopsy.
Come back here or PM me and let me know what happens, k?
-darcy (Matt's mom)