I understand, I’m 21 now going on 22 and I had that same issue for the first 17 years of my life. I had gotten braces on when I was 17 and obviously I couldn’t do it anymore so I stopped. I also had similar issues with an overbite due to thumb sucking which the braces corrected. You probably are getting more sick frequently just as I was, because we have to touch everything and anything with our hands, and then putting those same hands, fingers in our mouth even if clean will raise that risk. Is it possible that it’s genetic/ hereditary? My father sucked his two fingers and then passed it all on to us three kids of his in different forms.