Ah, no fun! I'm sorry you've gotta hide, but there's still lots of options, I think!
Some fun things I like when I've gotta keep it on the DL:
- Colorful shoelaces! I have a set with balloons on them but when they're all laced up you can hardly tell!
- Fun mugs! I kinda collect these, but it seems like no one looks twice at a silly coffee mug. My current favorite has a unicorn on it and says "I don't believe in humans", ha!
- Nifty keychains! These are usually small, hardly notice-worthy, and fun to fiddle with! The edamame ones are the best!!
-Really, any kind of fidget toy that fits in a pocket is a nice thing to have, not to mention easy to hide!
And last but not least...
CANDY! Easy to get rid of (in your tummy) and, well...candy! I keep a giant bag of dum dums in my little stuff and always have a few on me just in case.
Hope any of this helps, and stay awesome!
PS: It might be helpful to try to convince the 'rents that chewy necklaces/stim items aren't 'just for people who are autistic'. They've been proven helpful to folks with severe anxiety and other disorders (I have BFRB's and fidgets are a literal lifesaver). Just a thought, good luck to you!