Yes a lot of people put guilt trips on eachother. When my children were teenagers, 30 years ago, I read Wayne Dwyer's (sp?) book erroneous zones and it was all about guilt and worry. Still remember it.
Children often do it to their parents too, since my daughter had read the book too, I could say you are trying to put a guilt trip on me and then of course we laughed.
Ignore the guilt feelings, indeed it is a way for people to manipulate you and it has nothing to do with love.
You have to try to become stronger and follow your own choices, you are not responsible for your mother's happiness.