supposed to be the happiest day of my life...

I'm getting married soon and it's supposed to be the happiest day of my life.. I get to marry my best friend. Of course my parents are making me feel guilty and scared to even be around them. I'm sitting in my room right now just frozen and scared to see my dad or talk to him.. I hate feeling this way. 
I guess because I'm leaving.. they think I'm not gonna be there for them. I've been mentally abused all my life and it just gets worse. My dad feels like people shouldn't get married.. they should just stay single and save their money (he's obsessed with money) I've had some horrible relationships in the past and he of course brought that up. My fiancé is nothing like that.. he encourages me and supports me in everything I do.