"Who's going to want me?"

That's something for you to work on right there...

Perceptions are powerful... And seems from this statement that you don't believe you can be alone.

How about taking a step back and just deciding you need to leave your husband because its best for you and your children.

Try not to jump the gun and stress over finding another man, the goal is to be free of the current one, not to swap him out for an upgrade.