I’m sorry you feel that way, but it’s not true. All you’re missing is self-confidence and self-worth. It may not feel like it, but you are worthy of love and validation. Love yourself because you are alive and trying.
It’s not easy, especially if you’ve built up a lot of myths about how you’re broken or unlovable. Find the things you like about yourself and go from there. All you have to do is keep trying.
For some women that would be a turn off for a romantic partner, yes. You don’t have to plan a future with everyone you have sex with. There are plenty of women who want something casual and low attachment and would not be bothered at all by anything you mentioned.
Women are not a monolith. Each one of us is different and have different wants, needs, and desires. Don’t let the bullsh!t about you not being desirable stop you from trying. Rejection sucks, but never trying is much worse.