Non surgical ways to make breasts smaller?

I'm pretty sure I'm between an A and a B cup? I never really measured them and I don't wear bras. Anyway, I love being small chested, but I think I would feel so much more comfortable if they were even smaller, I get so much gender envy from flat chested fem leaning people.

A surgical chest reduction is not an option for me right now, I don't have the budget for such a thing and I'm also not sure I want to get the surgery anyway.