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10-12 hours of sleep is too much for most people, oversleeping is as bad as sleep deprivation. Most people need around 7h30-8.
It's well known that using pc, tablets, phones before sleeps makes it harder to get asleep, bc of the light.
If you can read books instead (kindle work too) there are ways to fall asleep too, counting tricks (counting while breathing in and out, helps clear your mind) you can find apps with nature sounds too (like this
Hiking is really good, just walking in a natural environment is known to improve your wellness.
There are class for adults in dojos it's in the evening.
You're not the only one thinking about your own mortality, humans have been obsessed with it since the dawn of time. It's more a blessing than a curse for me. Makes life more enjoyable. You have to learn to live in the instant, reflect on the good things in your life. your friends, your family.
I don't know much about social anxiety, but it's something everyone has to a degree, it's hard for everyone to make new friends. good friends I mean.
Try to join a club in something you're really passionate about, like that you'll meet like minded people. When I move to a new town I join the local board game club (pen and paper and the like) I always meet geeky and interesting people that way.
This one might be it: Nature Sounds Relax and Sleep. Or you could try searching for “white noise” apps in the Play Store.