what is happening to me?

recently my hormones have been starting up again even tho i think i am relatively late in puberty? I have no idea why :(

like since some months ago ive gone up 2 cup sizes and gaining weight in my upper thighs and now i have a little bit of stretch marks there which aren't that bad or even that prominent but i'm still really self conscious about them. everybody tells me that they'll just stay there forever which is the hard truth but i feel sad i don't even feel like myself anymore and overall this sucks :(