IANAD, but that sounds like clinical mysophobia (germaphobia).

No judgement — I’m sure COVID has done this to many people. But if it’s causing you anxiety or other stress, it may be worth considering talking to someone.

I think, generally, the real risks are overblown. E.g. many people can be anxious about the bacteria on our phones. And they do contain a lot, but most of them are harmless.

As long as you wash your hands when you get home from being in public, and don’t touch your face while in public, and clean your phone if you’ve been in a high risk public area, you’re likely knocking out most real risks.

Again, I’m not an expert. But I’ve done some digging on it, and this is my take, FWIW.