Anything you do on a phone with a rear facing camera(selfie) will be traced to you. You can gain some anonymity using a PC, but chances are, if you've ever, AND I MEAN EVER SINCE THE BEGINNING OF THE WORLD, used an email address for banking, taxes, shopping, employment, porn, etc: you are already on a list in a data bank with a number assigned to your identity.

And whether you "delete" or not will not make a hill of beans. Every keystroke is permanent and they will not forget who you are. There are massive underground data banks maintained by governments around the world. They keep getting bigger and better equipped all the time.