I Hate Myself For Being Weak

I wish I wasn’t so weak. I let people push me over, yell in my face, and I always run away from conflict. My friends flat out told me I can’t handle conflict. I always denied it but I always run away. I hate when people fight and get upset but it happens. I can’t even stand up for myself and my family can see that I can’t. Nobody believes that I will get into a physical fight. My dad believes I can speak up but doesn’t believe that I will fight because I’ve always been too afraid to fight and I let people get away with bad behavior. My brother said I’m WAY to easy going and let people do what they want and I see people overstated their welcome and I don’t speak up about it and that’s why people take advantage of me. My sister told me, “Girl you better start opening your mouth! Stop letting people push you around. You gotta push back. You need to say “NO” sometimes, otherwise people won’t respect you! Especially since you’re a young woman, stand up for yourself! I’m going to teach my daughter to be assertive and outspoken (my niece). Open your mouth because what if you were in a relationship and a man starts to beat and abuse you? You won’t speak up because you’re too afraid. You could end up dead so you need to start defending for yourself. Nobody is going to do it for you.”
Why is everyone so hard on me? I’m afraid of making someone angry or disappointing them. It isn’t nice to do that.
I apologize for the long story.