My boobs are too big and my back and shoulders are taking a huge toll for it

Hey, for reference I am 5’1, 145lb, 20F with 32DDD- last time I got it checked was I think March possibly. All my bras are always too big or too small putting me at constant discomfort. My back and shoulders are often and I mean very often in pain. I try back strengthening exercises/stretches, and I do have bad posture, but I have been trying to improve it. I get a massage about every 4 months, and I use like a heating blanket on my back. Im pretty sure that I do qualify for a breast reduction, but everytime I bring it up to my mom she argues back with “god gave you boobs, why not appreciate it and not take it away” or something like that. She is thin and well, she never had boobs close to my size my whole life growing up. I’ve been having them since middle school, training bra since grade 4. I’ve cried about it so many times, ever since 16 and sometimes my mom has noticed, but slightly just shrugged it off yk? I am so tired- constantly being sexualized, clothes never fitting me correctly or looking unflattering, being noticed first thing for them always, and this pain I have to deal with. It’s really hitting me right now that I want a reduction more than ever, I love my boobs but they just hurt and take away so much from me and I don’t know what to do.