For anyone like me, that struggles with this sort of thing, I find it’s easier if you stick with the basics:

• some generally appropriate hobby, like reading books of a specific genre, gaming (depending on audience), walks in nature, cars, etc.
• what you do for a living, especially if it’s something that you get some enjoyment out of
• if you have kids or pets, a general overview

Setting will dictate how shallow or deep to go into this stuff. Introductions at the start of some training course? Name and a short sentence about what you do for work, sentence about wjat you hope to get out of training. Someone giving a new hire a tour of work? Name, sentence or two about what you do, and if things are paticularly laid back and it’s likely you’ll be working with them, a sentence about a hobby. Casual get together? Name, how you know the host in like half a sentence, short hobby thing (if it’s a get together of nerds, or like for D&D, you can go a little deeper on related stuff).

Unfortunately, making introductory small talk is a balance of a few skills.

• knowing yourself honestly, not who you wish you were, and not what depression lies to you
• from the honest knowledge of yourself, picking what parts you’re willing to share
• general social awareness, to judge appropriateness of sharing those aspects. This is a skill that can really only be learned by repeated social interactions and learning to judge reactions (while discarding anxiety and depression worries)
• skill making small talk, which comes from social awareness, and also just experience having casual friendly conversations with very little stakes.
• picking up on interest and social cues, which again is just repeated experience

It sounds tough, and it can be, but flubbing this sort of thing also tells people stuff about you, and the people who would judge you negatively for it aren’t worth socializing with anyway. I’m a weirdo who has learned to mask. I like weirdos. I often enjoy when I can pick up that spmeone has a hyperfixation and I can get them to share that passion with me.

Just don’t dive a mile deep into your hyperfixation from the jump, as that is generally offputting for mixed company.

“I’m generally a private person, but this is my socially acceptable hobby”

I ask people to tell me something boring about themselves. Always gives an interesting answer.

Start with favourite dinosaur. Then talk about why pizza is superior to burgers. Then share the surreal dream you had last night about having balloons for arms. That should tell them all they need to know about you.

last thing I ever want to do is speak about myself, specially when the spotlight is on me