That sounds like a pretty hard way to feel, and also like a pattern of behavior that probably only makes you feel even worse in the long run. When we only do what other people want, we don't ever get to feel certain they DO like us because we can feel -- often validly -- they only like us because we do what they want. If we don't ever set limits and boundaries, one of the problems that creates is that we never get to find out who really *does* like us, you know? People who really like us will want us to be in a healthy interaction with them, very much including boundaries.
Patterns like this are probably part of why you haven't had good experiences, because it sounds like you're scraping (and trying to constantly appease) the bottom of the barrel here.
I saw your other thread where you've been talking to someone you're into. Is this someone who has been asking you for nudes, too, or is this someone who hasn't, or who you have been able to have some boundaries with?
Never doubt that a small group of thoughtful, committed citizens can change the world. Indeed, it is the only thing that ever has. - Margaret Mead