What am I...?

I can see why no one would want to be with me
I try too hard, and that's not the key
I think too much, which also drives you away
I lose my faith, more and more each day
I don't have much confidence after that
I let people walk all over me, as if I was a mat
I am too dumb, then to know when to quit
I keep trying to keep the flames of passion lit
I try to stay close to who I am with
I try too hard that it looks like a myth
I show off what little I own
I show you my heart is made of caring, and not of bone
I show what I think you want to see
I question you, if you show interest in me
I act just like a timid mouse
I look like I come from a normal house
I try and show you I'm not my twin
I keep going after your heart, trying to win
I fight against impossible odds
I take on challenges that no one can pass, but the Gods
I can see why no one wants to be with me
I don't look at myself, like you do see