Am i being unfair?

September 14 i will be turning 20 growing up my Aunt was my mom and dad. My mom is more like an older sister than a mom. we have a good relationship but it's not really like mother and daughter. As for my dad he's been in and out my life since the age 3. When he was there he would just buy me things or give me money then leave again. He's been in and out of jail my whole life. I'm his only child. Everytime he gets released he tells me he will change and try an dbe in my life, but he never did. he would get out and go right back to doing what it was that got him locked up in the first place. He wasn't there for any of my dance recitals, talent shows, proms, graduations, christmass's, or birthdays. If you ask me he was never there anyway. I feel like he treated me like i was one of the many girls he was with. Just threw money at me like he could buy my love. Now all of a sudden he wants to be in my life. He'll be getting out once again in a couple weeks and he told my step sister to tell me that he's going to change and he wants me to give him a chance. I'm just at the point where i don't see what i need him for anymore. he missed out on trying to be a father. his own mom even told him he messed up not being in my life. My step sister told me that i should give him a chance to be in my life because maybe he can't change. I don't believe that, i feel like once you have a child and you want to be there for them you should do everything in your power to try and change, especially if thats your only child. Luckliy for me i had my Aunt around and she took me in because without her theres no telling where i would be right now. My mom was there it's not like i never saw her we had some type of relationshihp but me and my dad never did. He never tried to know me so i don't see why i should give him that chance now.