A few points. What you have regarding the computers is "imposter syndrome", which basically means you are almost certainly better at it than you think you are. If you can get the job done then you are good at it, and it doesn't matter if you think other people are better at it than you.
The best thing you can do for your family is be there for them and love them. Having a loving and happy parent or spouse is infinitely more valuable than having a wealthy one. Don't underestimate your value to them in non monetary terms.
They might not realise that what they think is good natured joking is hurtful to you, so maybe try to get them to realise that your hobby is important to you and your mental health.
Basically don't underestimate yourself and the positive impact you have on other people, and also take care of yourself so you can take care of them.
I was chatting with a stock photographer a while back. Apparently the most important thing is the tags that you give the photos. The best ones are abstract because you aren't competing with "hand" and "pen". If you can make your photo of a hand holding a pen fit "wistful" or "trenchant" then you have a better chance of it being seen. Making thousands of weird photos like a hammer/screwdriver/wand being held over a watermelon/plastic duck/brick by a clown/policeman/nurse and giving them abstract tags is the way to go.