Big hugs to you, it's rotten to feel like this about yourself. I do think tho that perhaps it's less about trust and more about your own self-esteem?
A lot of people, actually, probably every single person who goes on a date will think those things... am I pretty (or handsome) or interesting, or will I say something really stupid and they will laugh at me. This is including the chap you'd be on a date with! You're not alone, but it's how we cope with those thoughts. Is the answer to get out there and face it head on, or stay at home, feeling more miserable just in case your fears are realised? It's less about fear of hurt by your post I think, and more about a confidence issue?

If someone hurts you down the line, yes it will hurt. But it will not be the end of the world. Again, we all get hurt, it's a way of life. We sort out the good ones and the bad ones, but can only do this by getting out there and meeting people and we also learn as we go along how to cope with the hurt.

And you made me sad about your bipolar. Please, never be ashamed of who you are. It's not your fault that you are bipolar is it? This is just one part of you, and as a wise person on PC wrote to someone else here (which I am going to steal from them) please do not let your illness define you. Look at all the wonderful things about you and let those be who you are first and foremost.
Also - do not second guess people. You say they can't handle it, but why not let them make that decision? To fear the worst all the time is making you too afraid to try. Perhaps there will be someone (or many I would suspect) who may just surprise you given half the chance.

Hugs.