That kinda sucks. My mom punted me to Dad when I was 15, and it was pretty disruptive. I hope that part goes well for you - but since you didn't ask for help with that, I'm gonna assume your relationship with Dad looks good from here

Like Lee says, feel free to talk, public or private.

Jealousy is no fun for anyone involved, but it sounds like you already understand that. And the approach of getting more friends seems sound to me (if you wanted a hobby that could be done alone, like gardening, I assume you'd pick one up). And looking online (including here) is a fine place to start, so it seems to me you're already doing the right things! Go you! If you like doing things WITH people online, consider online games.

Therapy is our friend too.