I also struggle with this. Some things that help, sometimes:

1. Come up with an alternate story. Someone isn't getting back to me? It's probably because they are busy, not because I have offended them.
2. Remember times when I guessed wrong: I thought that Suzi didn't get back to me because she doesn't like me, but it turned out I sent the message to an email account she rarely checks.
3. Remind myself that people are more interested in themselves than me.