Donna1964, I think we are from similar backgrounds. Although posters are very kind in taking time to post a message, if you arent from a dysfunctional background you don't realise you have been given a gift.
Children from dysfunctional families are damaged in many different ways. In your case you were the scapegoat so you're automatically blaming yourself. You recognise the pain of nobody being there for you, so when your friend who struggles asking for help, it was a compliment she could ask you as you're approachable. Most people like helping others when they go through tough times, so don't beat yourself up. Lots of people find it difficult saying no when asked for help.
The issue seems to be you're not happy with how much help you gave. Again, people from dysfunctional families find it very difficult to set boundaries.
I love what a previous lady said, that friends are chosen for their personality and not for what they give.
I agree with your point about you doing work on yourself, but keep on meeting people who don't do any work on themselves. People find it easier to blame others or gossip/put others down rather than look inside.