Honestly, you should check out some very basic self defense classes in the area.

I’m a woman and I go to a local Jiu Jitsu dojo (it’s 50% women) and have learned a ton already on how to stop / seriously deter getting picked up.

Biggest one is when you feel that grab come on, widen your stance and settle your weight down low. Even tiny people are significantly harder to move. Think about a dog when having to be dragged to a bath tub. This will at the very least give you enough time to scream and/or deter the attacker some - maybe even enough to leave as they realize it wasn’t going to be as easy as they expected.