Hello everyone

Im here looking for advice/encouragement on trying to kick this horrible thumb picking problem i have. I have been doing this for at least 5 years and its gotten pretty bad. Im in a relationship that has gotten serious i asked her to marry me and she said yes! But not everyone is perfect. My fiance doesn't like that i have this thumb picking issue as its something that is very hard to hide and everyone always asks me why my thumbs are like this and its kind of hard to explain to someone whos not going through it. I tend to have my picking fits when in stressed and/or anxious. Usually happens to me when im in a social situation. Any advice and/or encouragement would be greatly appreciated.