Am I being selfish?

My daughter is 3yrs now and she never met her father she thinks my boyfriend is her dad. He dad didn't tell me he was married his mom told me when I was 8 months pregnant and she didn't know about me until then. He didn't want to sign her birth certificate so I just gave her my last name he cut her hair and cut up her car seat when she was at his moms house and they are still hiding my baby from his wife and I do feel like my baby should go through this... My boyfriend's family treat her like she family she evens calls his mom grandma.... Should I let her know who her dad is? No negative comments please