Hi,
It is perfectly obvious that you have a mind of your own. Otherwise you could not be vegan in a non-vegan household. You probably need several heart to hearts with someone you can trust so you can sort out your own way forward to a happy and secure future.
I don’t think this forum is the right place to offer that. We are a disparate lot here, sometimes far too opinionated and self-satisfied! Probably the best on offer would be “Get yourself out of there” or “Get yourself a girlfriend” or, even worse, “Put your foot down.” And we can never know anywhere near enough about your personal circumstances to offer considered suggestions. Like for example your financial situation, how well you relate to others, your self-esteem.
I would strongly advise a visit to your doctor for a brief chat hoping for an introduction to a counsellor who could offer support.
Or you could make initial contact with one of the charities such as the Samaritans. I am not at all inferring that you are suicidal but the person you speak to could point you in a better direction than anybody here could.
Good luck,
Roger.