Not wanting to get marry

So my big secret is not wanting to get marry. Background I grew up with an abusive dad who beat up my mom. He would take her to another room so we would watch but when I was 13/14 years old she would always tell me not to get marry. She would tell us that when she got Married the abuse would start. I don’t believe my boyfriend is abusing. We’ve been together for 7 years but I’m scared to marrying. He doesn’t mind if we marry or not but I’m scared to

Marry because of my mom. Is this normal?