Thumbsucking

I can't remember a day when I haven't sucked my thumb.
I'm 23 years old now and it has ruined my teeth (I've never seen a dentist and avoid it due to this habit).
I have learned (habit now) to NEVER do this in public.
After so many years of doing this, I'm usually not even aware I'm doing it.
I also use a piece of lint in my other hand which is also an unaware habit now.
I have destroyed many blankets in the process.
I have also learned that the lint ball sucks up dirt and oils and makes me sneeze if I hold it in my thumb sucking hand. I throw them away eventually but blankets are destroyed more often.
I use it every night to fall asleep and can no longer sleep without it.

Does anyone else have this problem?
Is it possible to stop doing this and how?

Mods I didn't know the appropriate place to put this thread.

What have you tried already? Have you gone through anti nail biting polish, gloves, strongly scented hand cream?

A rather radical suggestion. I sucked my thumb until a similar age. Although just at night. And less often so it didn't [too strongly.] Affect my teeth. I finally broke the habit when I got my tongue pierced. It was just too uncomfortable to carry on. It might be too dramatic for you to consider. But it did work for me.

The lint habit seems like it's one that could carry on. And be the "bridge" to help you sleep still. Any change in habits is hard. And you might well have a week or two of terrible sleep. While you get used to the new way of doing things. But it is possible to change. And even if just so you can get to the dentist. It seems like it's going to be worth going through a hard time. Some dentists specialise in nervous patients. If you can find someone like that. Then they're likely to be very open minded about the thumb sucking too. Such people know that habits are super difficult to break. And that there's no good in "telling you off" like a child. They'll treat you like an adult, and should be sympathetic and constructive. And help you get back to dental health, however you choose to define that.

I also suck my thumb and, now, since using a CPAP machine (nasal pillow style), have been forced to turn to a pacifier which stays in my mouth because I use a headstrap. After 8 months I notice my teeth moving forward a little but I won't stop as I really need it to sleep well now.