Can anyone share with me how God has changed their lives...I'm thinking about going to church?

I recently posted a question about how unhappy I am at the moment with my life. I'm very resentful towards my in-law, step son, his mother...I'm to the point were I'm changing my mind about my marriage like I'm changing my "undies"...daily!!! I'm exhausted, tired of being just out right mean to my husband for now reason and constanly looking for the smallest reason to majorly verbally abuse my husband for his family action. No I'm even starting to me rude to them on a daily bases. I'm tired and want to like and love my inlaw and step son. I feel like I've done too much though for them to ever honestly like my again. I totally believe in God, but I wasn't raised in a church going family...help please....I don't want to be so hateful anymore!!!