You're probably selling yourself short on the tech front and over-estimating the difficulty of installing something new. If you wanted to install something like Linux Mint or Fedora, the most complicated step would likely involve making a bootable thumbdrive to load it from. You could check that all your hardware works as intended (ie, can you connect to wifi, does sound play properly, can you watch a video on youtube, etc) without actually modifying your base OS, and if it does, the installations mostly hold your hand and you can get a perfectly sane setup just sticking to the defaults for most things and clicking next. There are plenty of options out there where you don't need to be a command-line wizard to have a perfectly usable system.

If you're interested, Linux Mint Debian Edition is pretty easy to setup and use.

https://youtu.be/b0EBueufP0o

I recommend using the debian edition image and not the ubuntu version.

https://www.linuxmint.com/download_lmde.php

Someone mentioned turning a PC into a Chromebook above and it's not a bad idea. You can probably install Android apps on it for streaming services too. All you need is a flash drive. I probably wouldn't mess with it though if it's your only device if you aren't that tech savvy.