I had a conversation with a friend about this exact kind of thing awhile back. We realized we had opposite expectations. She was under the assumption that people just kept stuff she told them secret unless specifically told that they could share it. I operate under the opposite assumption: that nothing is a secret unless the person sharing it specifically says not to share it (that applies to myself as well).
Regardless of which assumption one operates on currently, it’s much safer to operate under the latter one (I highly recommend it).
Family can be even more complicated, because in my experience even if you tell a family member to keep something a secret, that usually means, to most people, “keep it a secret from strangers” and you can bet that your other family members will find out about whatever it is you told that person.
Aside from some of the other things people have already mentioned, going to or volunteering for various festivals and conventions can be a great way to meet random people and get out of the house. If you’re volunteering you’re more likely to end up meeting more local-ish people (like from whatever nearest Metro area the event is occurring in since you said you’re super rural).
Even if you don’t meet any cool new friends you want to stay in touch with, they can be a ton of fun and are a great reason to get out of the house. I’ve ended up having some really amazing experiences that I absolutely never thought possible just because I got out and went to Conventions (mostly anime or game conventions for me, but there are all kinds).