I think I may be a pushover or maybe a coward.
Are you joking? You really think you are a coward?
Yes. I failed many times in my life.
It can be hard to stand up to people but regardless you shouldn't let others push you around. Be brave and defend yourself.
Why should? They are not stopping until they make me quit or do what they say.
They will stop if you stop them from pushing you around. If you keep letting them push you around, then they will never stop and you will be unhappy.