Two versions of nodejs: Causing conflicts with npm node-sass

Hi everyone. When I enter node -v, I get v12.18.1 and with sudo node -v, I get 14.16.1. This has not caused any conflicts until recently when I started using the npm package node-sass. I initially installed the package without the sudo command, but had to re-install it and then used sudo. The error message said that my runtime environment has changed and "npm run compile:sass" would not work.

How do I get rid of the older node version. I tried the solutions suggested online, but I get a message in my terminal that my distro does not support the latest nodejs version. This would be a big problem because I am a newby web developer. Should I switch to another version of Ubuntu?