My struggles with pursuing hobby

Hi, I do have an account on here but feel more confident posting this anonymously,

I am on the autistic spectrum and are really passionate about trains. I really enjoy watching them go around curves in particular due to the amount of noise that can happen from the wheels. Something about those sounds are really appealing and soothing.

The only issue is some places I goto to watch trains are in public view, and people walk past / cars drive past and some people give me that look like "Why the hell you just stood there". I don't feel very confident and are quite insecure, and actually care a lot about what people think of me. I also feel like joe public think trainspotters are strange.

I get that my hobby is eccentric but it harms no-one and I just don't like some of the scornful looks I get, from teenagers in particular (Im a 20yr old male).

It just makes me feel really embarrassed just standing there waiting for the trains to come past cause people won't understand why I'm there and that it's my passion. I also tend to watch youtube videos on my phone with earphones in whilst waiting for the trains (usually self Improvement content), or do university work on my phone. I also don't feel confident telling passerbys what I am doing.

Should I just not care about what people think of me and just smile back at people (even if they give me weird looks)? Cause I tend to avoid eye contact and are socially awkward and when people give me scornful looks or jeer me it upsets me.

I would appreciate anyone's thoughts on this if they understand. Thank you!