It sounds like there is something going on so do not ignore your symptoms. You need to be exained and possibly have some tests to see whether this is cancer or not. It could be harmless, but needs a work up to be sure. Regardless, this is not something you can figure out on your own. At 15, things look very black and white. Embarrasment may feel like the end of the world. It is not. Sometimes just figuring out what to say is difficult. Just say something like "I have a bump down here and want to see a doctor - don't ask me any questions right now - its embarassing enough". How's that. Your parents should know. Parents WANT to know - they will help and you will show them that you are a good decision maker. If for some reason you have not mentioned you will not go to your parents. Seek an adult you are comfortable with to confide in first and to help you tell your parents. This person could be a teacher, adult relative, clergy person, coach, etc. Be strong and mature. Courage is not the absense of fear - it is acting even when you are afraid. Good luck.
I know that. I'm just really not wanting to be wrong about it. It's more of I really want to know if its serious, if then i will do something about it, if its not then i'll figure it out myself
I know it can be embarrassing. Trust me I know. But you are 15 now, you are starting to mature into an adult. It is time to step-up and prove that you are growing into a man... you do that by talking to your parents. Trust me when I tell you that after the initial embarrassment of telling them a huge relief will come.
I know that every single person that reads your post tonight, tomorrow, and the next day will tell you to do the same thing. This is not something to be embarrassed about, rather, it is a time for you to show your maturity.