It’s not a good idea to use software that’s reached end of life, but it also doesn’t help to sensationalize the “death” of Windows 7 like it’s the end of the world. Here are some sensible articles on how you can continue to use Windows 7 for the time being without being too worried:
Note that Windows 10 has roughly the same hardware requirements as Windows 7, and it runs a bit faster in my experience. I have been using Windows 10 on my $200 Asus EeeBook for over four years without many issues (Intel Atom processor, 2GB RAM). There are also a bunch of fantastic Linux distributions to explore – give lightweight options like Lubuntu, Xubuntu, Manjaro XFCE, Ubuntu MATE, or KDE Neon a chance.
If you do choose to stick with Windows 7, however, your computer and applications will keep running just fine for the foreseeable future.