How do I cope with having an abortion?

I'm 16. I just feel like this might make me more of an addict to heroin. I already am one but I just am having hard time coping with what I'm doing tm. I am 21 weeks pregnant and addicted to heroin. My parents won't help me with the addiction unless I abort. I've decided to abort. Not just for me but because I have no way of raising a baby as a a jobless 16 year old single girl with a heroin addiction. I think when I give birth that they'd take my baby away. So I guess abortion is the best choice I'm just having a hard time having an abortion just because I suck as a mom and it really is going to be a problem. Anyway, how can I cope with an abortion? Plz anyone a little advice would hep?