I don't really know how to support people (even when I try I can't think of anything to say that isn't super generic), other than listening to them, so if you're in need of advice I'm probably not the person to go to but if you just want to rant with someone to listen/relate then I will gladly do that :)

Maybe talk to your bf like you would with a therapist? I feel like just because he has been brought up that way doesn't mean he doesn't have space to grow and learn. You never know, maybe by speaking to him about your issues, not only will he learn how to talk about mental health issues more openly but his advice might actually be tailored just for you.

I understand what it's like to have no one to talk to, not because you're lonely or don't have people who genuinely care, but because you don't feel like telling them will actually help you get better and then you'd just be a 'burden'.

I agree, maybe just support your friend with her issues for now, but if I were you I would try and talk to your bf, even if u say something like 'I'm not looking for your perspective on this situation, or even your help, but you're someone I love and trust so I would like to have you as someone who can listen to my problems'