I know therapy was suggested and you may try it, but you also said you get over things pretty quickly. I would say, at first glance of your writing style and thought process that you are a high functioning adult and probably don't need to worry about genetics for the case of having children.

Research what trauma to a baby can do and see if it's valid to how you handle stress. It seems like you are having a normal and natural reaction to a bad discovery about a past you had no control of.

I don't like my mother for putting up with my verbally abusive father and I have made posts about it here. What can I do about it, I've told them to divorce, live apart, anything to stop the misery of their arguing, but they must enjoy it.

Lots of research into good mental health suggests that pain must be acknowledged and kindof attacked until it turns into a positive thing. Researching better ways to have good mental health is a great alternative to just enduring a mystery of your painful childhood that you have no recollection of. If you can't afford a therapist, or don't like the experience I would say you are fairly strong enough to live how you were living, but at least tell a friend about this. Opening up is good and bad. Therapists are great but I know for a fact that most Americans can't afford to have one, unless you are disabled.