I don't know how to stand up for myself
Why can't you stand up for yourself?
I'm not really good at doing that.
If you aren't good at standing up for yourself then you should learn how to defend yourself. If you never stand up for yourself you will be bullied.
You're making me have to defend myself when there's no need right now. There just might be one day.
If you learn how to defend yourself it will bring confidence to your life.