You're giving yourself not just too much, but the wrong kind of pressure.
Find something that's more fun and interesting to you than browsing Facebook, something you'd rather be doing, and something that scratches an itch or helps you learn something you want to know.
Don't do it for social value, don't expect to give more than you take, and don't commit to it. Do something for yourself, and those things will happen naturally as a byproduct when you find the right thing that you care about so much more than Instagram that you can't bring yourself to browse Instgram.
Finding the thing is your job at this point, so don't stick to one of the things you listed until you try them all and try many other things too. Try boating, or woodworking, or exercise, or eating, or volunteering at the homeless shelter. (If you want a blog or vlog, you need stories to write/video about, after all.) Find something you enjoy before you even think about commitment.
There's almost nobody writing blogs or open source software or posting videos to YouTube that are worrying about their contribution to society -- they are doing it because they love it, they like participating in the activity for reasons that primarily benefit them -- and only occasionally and secondarily do they benefit others -- and that's okay!