Ladies, why cant I get my bra straps to stay up? Ever?

Every single bra I own, aside from the ones that can also be fashioned into a cross-back (cause obviously then they cant fall down), the straps, I tighten them to be as small as they’ll go, but not only is that not enough, but they come UNTIGHTENED in ten minutes and then I’m left pulling my strap up and it’s annoying, embarassing, frustrating, and I don’t understand why it happens. Is it because I have an usually small distance between my boob and shoulder? I don’t frickin understand it. I have literally almost stopped trying to wear a bra normally, which sucks because the only ones I have that I can do the cross-back with, aren’t “nice” bras and I only wear them to work. Because of where the straps go when I do that, too, I can only wear them with normal t shirts so that leaves a lot of my shirts without a bra to be worn.

I have been trying to solve this problem for 10 years now. Does anyone else have this problem and have any solutions? Brands? Anything?????? Arr!