IMO, I think you're being a little paranoid (I say as someone who was extremely paranoid when they first started getting into privacy). Take a bit of time to look into what is actually possible and how you can properly protect yourself, and hopefully that can put your mind at ease.
I don't mean to say all your fears are unfounded, or to just stop caring about your privacy and focus on learning, but taking a few days or weeks to understand better what Google (or any other company) is truly capable of will probably be better for you in the long run. You should also consider your threat model and what you're willing to give up (if anything) in order to live a more private life. If you have to watch YouTube, Google will always have some sort of data, but it is possible to remove most (if not all) connections to you.