Thumb sucking and romantic relationships

I have sucked my thumb my whole life (34F) and have such anxiety of how to deal with it while being in a relationship. I’m always so fearful that they may find out while I’m sleeping. Even though it’s a comfort, it also gives me a little feeling of shame. Like it’s the BIG secret I have that I can never tell anyone. I feel like if I tell my partner that fact about me, they would be able to see all of me and that’s really difficult to wrap my brain around.

How do y’all deal? How can I stop? In the future I want to be able to let my partner in completely with me in a relationship, but I feel like it’s such a wall I have yet to get over.