Need answers!

Amanda • “Life is a balance of holding on and letting go.” 🦋
I don't know where to put this under. For the past week, my left breast to the top of it has a huge lump. I did a self check to compare both breasts and there's a difference! It feels hard, sometimes its tender to touch and sometimes I'll get a tingly feeling. And it's not hormonal for my period coming. I even think my left breast looks bigger from it, I know you'll always have one breast that's bigger than the other. Mind you I'm 16 and I'm not thinking anything of it being serious. Where would I go to get this checked out? Gynecologist?