Context
I'm 19 years old and I live with my mother. I completed an apprenticeship in software engineering earlier this year. I'm now working full time at the company where I finished my apprenticeship to save money for the university.
Now, to the topic. I would describe myself as an introvert. However, I don't think I'm an insecure person whatsoever. I don't have problems attending social events, interacting or working with other people at the company. I just feel more confortable alone, so I spend more time all by myself, doing research on topics I'm interested in, coding some projects of my own or just losing myself in a delightful tricky problem. And I don't have a problem with that really, the tasks satisfy me and I never feel dejected or depressed at all.
My circle of friends is pretty tight and everyone I engage with somewhat frequently, pretty much shares my mindset. When we meet, we often spend hours discussing various topics, challenging each others views, contemplating about pretty much anything what is on our minds or simply enjoying a pint of beer. We meet a few times a month and that's perfectly fine for me. In my opinion, the position I'm in right now is perfect for me. The balance of my social life and the time I'm on my own fits my mindset exactly and as said before, I don't feel generally unhappy with my situation.
However, my mother seems to be worried about me for quite some time now. And yes, I gotta say, I'm more of a calm person. I don't talk as much compared to other people of my age. But I wouldn't say I'm shy, because I don't have difficulties expressing my feelings. I just don't show them as expressively as others do. Nevertheless, my mother often asks me if I'm happy where I am now and I noticed that she's worried about me. And I understand why, I am not out as much as other people of my age and I am certainly not as energetic as other people, but as I said before, I am happy where I am now. And I tell her that every time she asks, but she doesn't believe me. I talked to her a lot about that subject and she can't or won't accept what I try to tell her.
I think no matter what I say, she always draws comparisons to sons of her friends at my age or her youth and I'm starting to get tired of having this conversation over and over again. I don't want her to keep worrying about me, when there's no reason to. How can I convince her that I am happy how I am?