Are stretch marks on breasts a turn off?

I have an endocrine disorder that has caused stretch marks all over my breasts. They are a bright reddish purple color and needless to say I am super self-conscious of them. So much so that I’m afraid to let my boyfriend look at them when we are intimate. I can’t really hide them from him and he’s never said anything but I can’t help but wonder if they are a huge turn off.