I have always been an over achiever too, I have the classic type A pers. which makes it difficult for let downs. I most always blame myself for problems or anykind of turmoil within my family or social situations.
Do you mean that your parents have been though a divorce? Of course when you have kids or are a family they all go though it with you. My mom was divorced twice by the time I was eleven years old. I have just went though my own divorce and know how difficult they are. I think it is important for parents to communicate with their kids when they are going to divorce as no doubt the kids are going to feel responsibility in someway but, I am sure that you didnt have anything to do with their decision. Just sometimes some people cant live together and feelings do change over time and it is much better to seperate then to keep hurting each other by staying together in a relationship that is broken.
You sound like a smart guy perhaps you can drum up the initiative to speak to one of your parents regarding your feelings. Counseling is an excellent idea for parents and kids after divorce to help move on from this in a healthy way. Many churches offer divorce care counseling which I think is free or little fee.