Why do I attract desperate/clingy men?

Many times I had to block, they seem interested in a relationship but they get so clingy, have emotional issues, ask for naughty pics and push into dating too fast. How do I stop this? This is why I'm a little nervous with dating because the guys I do click with and have similar interests are not interested in me back.
It just seems when I get friendly with a guy, we talk for a bit he just gets clingy and creepy.