I think I might have endometriosis?

Lee
Any information is helpful because I am freaking out. How would I know if I had one is it very obvious and painful I've basically had my period for almost 2 weeks now and I'm starting to get a UTI feeling and it burns when I pee. My friend told me about this and after looking it up I'm a little nervous how do you test for it? Has anyone gone through this before? Please help!