My family are like Alphas and I'm not?

Basically my family are Alpha's, confident, emotionally strong, can take on anything that comes there way and I'm more like Alpha 5 from Power rangers.

I shy away from confrontation, I'm basically a people pleaser unless someone pushes my buttons too far to annoy me which takes a lot and then I will bite back but basically I'm the wimp of the family.

How can I stand my ground more? I think I just feel if I argue with someone I'm gonna get a punch to the face and I'm not a fighter, never have been...
My family are like Alphas and I'm not?
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