I feel so bad about my chest...

So when I was growing up my chest would kind of just pop, like I’d grow a cup size in a week. I have G cup breasts now, and all those growth spurts gave me tons of stretch marks from my collarbone to my nipples, and from the bottom of my rib cage to my nipples the other way. I don’t feel like I can ever wear anything lower-cut and I’m super self-conscious about it... just looking for support or similar stories.