You won't make it worse. If he's waiting, he might be worried you aren't into him.

Best advice here

What can I do without being a creep? 🥲 We’re neighbours and I don’t wanna become the weird girl he sees at the park… What if he just feels sorry for me being shy/avoiding him or something

I don't see any of that based on what you posted. It's clear he likes you too, and he's probably also worried. If he already made an attempt, he might be waiting for you now. Just say hi.

Edit: See if you guys can text for awhile, he might be shy too