How do you stop someone from venting their problems onto you?

The problem is my mom. She has been talking about her personal problems with me since I was in junior high, and now I'm in college. I have told her several times already to stop and it's always the same things, problems with finances, problems with my dad ect. I tried offering my advice of directly facing her problems before, but she just won't do it and she claims that I just don't understand because she has all these ailments like severe depression and agoraphobia. She's nice to me, but I'm almost ready to transfer out to a college further away and move out on my own a year early. It's not that I don't want to help her, it's that I know I'm the right person to help her and I don't want to have to always worry about her problems too.