Someone tell me what this is

I’ve been really conscious about my breasts lately for no reason I’m just becoming very anxious every little mark is freaking me out I’m only 17. Underneath my right breast there is a white scar like mark and I wondered if anyone else had something like this or new what it could be it comes out slightly as a bump and is bright white I don’t know what this is and I’m getting so anxious I also have purple marks near my nipple and around my left Breast I know this may just be stretch marks and I’m just freaking out but does anyone know how I can check what’s what as I google things and everything I type leads to breast cancer which probably isn’t the case and I’m just scaring my self also this mark has been there for only the last couple of months so not for long so isn’t a birthmark or anything