My dad was a drug addict and overdosed and died 2 years ago.?

i probably need therapy, but when i was 5 my parents were divorced because my dads drug problem he refused to kick& my mom didnt want me around it. so i grew up never being around my dad although i was a daddies girl b4 they were divorced.when i turned 19 i ended up moving in with him although his drug problem had only gotten worse. when i was 21 he overdosed and died and to top it off he died the day after i told him i was pregnant. my question is my whole life ive felt like i wasnt good enough for my dad to quit the drugs and choose to be the loving father that i need and now i have no a problem with my self esteem and constantly feeling like i need love from a man. this is the first time ive been single in 4 years and now i can feel all the pain that ive been holding in for my entire life coming out. how can i overcome this love addiction and feeling like i constantly need a man. :/