How do I form a good relationship with my father?

I just recently started living with my real dad, afterliving with a relative of my moms that had lost their baby soon after i was born. My mom became extreamly depressed after i was born, and ended up commiting suicide when i was 3 months old. My parents were in high school when i was concived, so my dad is only 19 years older than me. He is sucsessful, and has enough money and then some, so there is nothing wrong with me living with him. He is actually married now, and his wife is expecting a child here. Thing is, me being there reminds him of my mom alot. We have alot in common and all of that, but he dosent like to look at me too much because i look so much like her. I though that i could deal with this, but it is hard. It is even damageing his relationship with my stepmom, which i blame myself for. How can i help him realize that, my mom is gone and that its ME here now?