Is it wrong to not let dad be part of the picture?

Okay so I need everyone's opinion.. I got pregnant with my boyfriend that was not planned. He smokes weed all be time and party's and drinks and  was really mean and controlling to me ... So I just didn't ever tell him I was pregnant and I just had my daughter a month ago.. I'm starting to feel really guilty now and some days I want to tell him but someday a I don't.. Please tell me your opinion. Is it really that wrong of me to not give him a chance? I'm just scared he's going to try and get some type of cusp day of her :(