Just tell your mother that some people are happy being more solitary and that you are one of them. If she says that's not so, you can tell her from me, that it is so, as I have always preferred being solitary, and don't enjoy being forced to be with other people all the time. I do go to family gatherings occasionally, but I am not a social butterfly, and there is nothing wrong with that. Being solitary is fine, as long as that's what you like. The only time being solitary is a problem is if you prefer being with others, but they don't want you around. Then the unwanted person can get bent out of shape over being rejected.
As a child I would go on walks and bike rides alone. I went to the movies alone, I occasionally eat out alone, unless my relatives take me out with them. My Asperger's problems bother me, but being alone is my preference, and not a problem for me. I am a happy hermit type.
Most people are more social, naturally. So your mother is worried because you don't fit into the main category. Just remind her that everybody is different, and you are okay with being a solo type person.
I do suggest, that while you are living with your mother, that you compromise, and go out one weekend a month with your friends. It should calm her down some. Just don't spend the other weekends like a couch potato, though. Engage in some sort of activity when you are at home, even if it is just reading a book. If all you are doing is being a couch potato, then you are just being lazy, and your mother has a right to be annoyed by that. Try helping with the cooking and cleaning on weekends, take up a hobby, read a good book, catch up on your home work, take online college courses, etc. Do SOMETHING, while you are at home. Other wise your mother will keep getting on your case, because acting bored looks a lot like being lazy, and that drives parents nuts.
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If a man does not keep pace with his companions, perhaps it is because he hears a different drummer.
Let him step to the music which he hears, however measured, or far away.--Henry David Thoreau