I think for a lot of people, they know they are because of the quality of their relationships. They have parents, siblings, friends, people who want to spend time with them. I grew up with my Nan who was the absolute best and her death when I was a young adult was very tough.
I have difficult relationships in the rest of my family, I just don't know if various people like me much at all, beyond the way they maybe can love me out of a sense of family loyalty, without liking my company. Or if they just honestly feel they are putting up with talking to me every once in a while because of duty.
It's not just immediate members either. A cousin who for a long time seemed to like me a lot stopped speaking to me completely when I got a girlfriend and came out as bisexual.
I have a wonderful partner who I love very much and am very lucky in life in lots of ways, but sometimes I feel a bit low and unsure and think I must really be rather unpleasant as my family are so indifferent to me really.
It's hurtful because for so long I just really wanted to be loved and included by them...now, I've accepted I'm not that important, that they do of course love me in their own way they just don't want to spend that much time with me. It's ok, but at times, still feels a bit raw. I think mostly because of what it could mean. Not as dramatic as thinking I'm outright a BAD person lol but just not nice or fun or good enough.
I'm also disabled and require support from my partner, and sometimes wonder if I am deserving enough. There are so many sick and disabled people who are very loved by their families, who can't pay for medicines or equipment.
But how do you know that you are a good person? Especially if you are not close to your parents or siblings?