You can go to insane lengths, but it will make you insane.
Diligence, tenacity, questioning authority, using pseudonyms, alternate identities (within legal contraints), and being sensible can be rewarding.
I'm betting your browser doesn't have NoScript or Ghostery.... and your phone is an Apple (some say less tracking, others don't) or an Android (just email your every waking moment to Google and friends) and you can mod both phones to be less tracking.
Take a deep breath, acknowledge that they track you, then do what you can to stop it. Question the need for SocSec, phone #s, addresses, at each and every turn. Don't use barcode store cards-- or use someone else's. Pay cash for top-up charge cards, and use them once.
Steal This Book and other tomes (which you'll steal or pay cash for) are great guides to anonymity. Think about them. Don't go crazy.