How do you know you really don’t want to be with someone anymore?

I’m 19, married, and have a 1 year old. My husband was 22 and I was 17 when I got pregnant. We soon moved in together and after moving in, we had nothing but problems. All the lies and being sneaky, talking to other girls(never slept around, that I know of). I was scared to marry him from the day he proposed, he asked me to marry him in his messy bedroom at his mothers house a week after I found out I was pregnant. And I said yes, all along I always second guessed marrying him. I’ve told my mom and she doesn’t know what to say. After getting married we decided to buy a house and now I don’t know what to do I don’t see myself with him in the future but I love my daughter way to much to risk losing her to him. I just want out and I don’t know where to start. I have no credit so I can’t just buy or rent a house. I have a car but all my family lives in another state. Somebody please help me. I just want to be happy for once.