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Some mothers are bad. Some fathers are bad. I have a bad father. I have barely spoken to him since I was 16. Your mother does sound like a bad mother and for you to feel uncomfortable with her given how she treated you for years is normal and fine. Hopefully as you get older, you can create your own family in the people that you meet.
I notice that one writer wrote "you never know how much your mother does for you, blah, blah, blah." I remember talking to adults about my father when I was a teenager and told them similar things to what you are saying and getting lines just like that. People who write things like that generally don't know how hard life can be.
Your mother was not there for you. She pawned you off on others and let you waste away your summers in lobbies and only bothers to try to have a relationship now that she is lonely. It is not your responsibility to love her back or to be her friend. You are nearly an adult, you will be free soon - get away from her as soon as you can - be strong and be independent - don't worry about being a cat lady - just reach out to others. It may take a while but you will find friends and people you trust. Mothers have an obligation to their children. Children have an obligation only if they are treated well and if their mother fulfilled her obligation.