Stay calm, negative emotions are never good. I know it's hard now but in time you'll organize your thoughts and work things out. He may not be your dad from birth but he decided to take care of you and that's good enough. Best wishes to you.
Life is too short to be mad. Where is your real dad? If this man has been kind and supportive of you , you have no reason to be mad ,Sit and converse and ask questions, but respect him for what he has done to make up for the dad that couldn't.
I KNOW I WOULD MAD!!!but calm down he is your father if he loves u treats u well and helped raise u he was just trying to help survive and help u he's been your father up till now why stop loving him now?
I don't know all the details of the situation but generally speaking, I would say that the man who raised you is your real Dad. If some other man just planted the seed and took no responsibility for you, I'd say he wasn't much of a Dad. Of course I don't know if that's what happened because you don't say. Unless there is some other reason to be angry with him, just treat him as a real Dad. Did he treat you like a real Daughter?
say hey dad i miss you and love you Idk why you left but im glad your hear now you stay calm and then you appreciate the guy that was there when your dad wasn't and always keep him in your heart he was there like a father figure when you dad wasn't and you mend your relationship with your real dad by talking to him asking how he has been and then ask him why and hang out with him and tell him how you felt when he left so he understands your pain.
The man who raised you is your real dad even if you dont share genetic material. Dont be mad or stop talking to him. On the contrary sit down and TALK to him. Ask him about it. Biology doesnt necessarily equate 'real' anything.
Before you found out how much love have you had for him ? My guess is that nothing has changed, you are just shocked. Blood does not make a father a father. It takes a real man to father a child well and a better man to father a child that's not his own blood.