Check out Hipcamp. I specifically look for places that only have one site, as once you get into the places with multiple sites you risk there being another dog.

I moved to Vancouver at the end of 2019 and I have some of the best friends of my life. 10-12 great friends. Definitely had to put myself out there, though. Bumble BFF and Facebook groups were mostly how I found my people!

As a Vancouver resident who moved here in my 30s, I’d agree with the comments above about moving closer to a city; Vancouver would be great, for the sake of your social life, you can meet folks here and across the bridge in Portland. There’s nothing wrong with Longview but I think it could be limiting for someone your age trying to find other people with common interests, hobbies, dating, etc.