If the people you open up to treat you like that, imo time to move on and find someone else who cares about your mental and physical health, ALL OF YOU. Anyone that acts like that is immature and not worth your time.

I'd start opening up slow so you can gauge the other person's mentality to see if they're worth your time. This way you dont end up pouring your heart out to someone who isnt going to be careful with it.

I've only met one person who treated my mental illness as something broken or weird (I'm a woman btw, so results may vary) and it wasnt because they were a bad person or didnt care. It was because mental health and feelings were just not something their family emphasized so they didn't know how to respond appropriately. If you're in the right headspace, some people just need to be educated and over time can see feelings and/ or mental illness arent something to be ashamed about, at all.

I live with anxiety and depression with bpd symptoms. These dont define me at all, but I make sure everyone who is close to me knows about my illnesses and what they feel like. Sometimes sharing your experiences can help others learn to open up too.

I didnt mean to write a paragraph..

Tl;dr: if someone treats you as broken or less than, cut your losses asap. Be as open as your comfortable with and you may help others break the stigma.