Do you think maybe your confidence is holding you back a bit after your past experiences? And maybe overthinking or focusing too much on trying to do the "right" things/trying not to do the "wrong" things when you're with someone.
Perhaps if you tried to "let go" and be YOU/feel comfortable with being YOU a bit more. Afterall if whoever you're with isn't going to like you for you they really aren't someone you should want to be with anyway.
And you know, as painful as it is, sometimes some relationships just aren't meant to be, BUT we can learn from them and take that forward . Maybe see it more as taking you one step further forward to being with someone who is REALLY right for YOU.
I would say though to give yourself a little time after the last relationship if it really knocked you. After all you really don't have to be in a relationship to feel "validated". Focus on yourself, focus on feeling better in and about yourself then let other people have the privilege of seeing that. If they don't then hey, it's going to be their loss isn't it?
And, yes you do sound great just be yourself hang in there for someone who's right for YOU.