turns out the father i had grown up with, who raised me since i was a baby
isnt even my birth father, there was no name on the certificate just a blank
i found this out by this man calling me, he read off my social security number, he said he was late to my birth, he repeated my full name, my moms full name
i never really thought about it but i look more like this guy then my dad

so what should i do?

Call your mother.

What are your options?

First, verify with your mom that this man is your biological dad and that it all checks out. If he is, then I'd say talk to your biological dad and see what he's all about and why he wasn't around, and keep in mind that the man who raised you was there for you growing up (provided he did a good job.) If you like your biological dad, then catch up with him and make up for lost time if you want to. Or whatever.

It's cliche to say, but just do what your heart tells you.

^ This, this, and this.

I'd also question who this random man calling you is and--even assuming that he is your biological father--why he has your social security number, by the by.

i did she said "dont call again" and hung up
me and her have no relationship because shes psycho and hates my guts
so that is out of the question

You should still accept your non-biological father as your real father. He raised and probably loved you just as much as any father would, so I don't think this news should ruin your relationship with him and I really hope you don't consider that (unless you have reasons to).

I think it would be a good idea to look up your biological father. If he turn out to be a good guy I'm sure you would be able to gain a healthy relationship with him. You've got a connection to him after all, if he is your real father, and if he turns out to be a cool guy then that's great.

Sounds like the opening to a drama/thriller movie.

This might be because I was conceived through IVF and I've never known my biological father, but I think biology is very much overrated. So what if the man who raised you didn't get your mother pregnant? He's still the one that cared for you, loved you, was there for you. He is your real father.

If that's out, then ask this new guy if he's willing to take a paternity test.

Some of us never had one or more parents either, so it's vastly over rated.