I think i might have AS - nest steps

hi, I’m 16, male, and I think I might have AS (see title) anyway - I need to know for sure so how do I go about finding out - do I just stroll into my gp and well

and what??? I’m clueless what to do. Can you just ask...

Ask to find out? Sorry I’m not making sense. I guess I don’t know what to say.



So if I wanted to know the opinion of someone whit a bit of relevant medical backing - what do I do. Be extremely clear?!

Thanks

title should read next steps - i should not try to type at this time of night