Dear friend.
Thanks for sharing your concern.
Definitely the cause for your front teeth protrusion is your
thumb sucking habit.
Now do not worry, this can be very well corrected by orthodontic appliances.
please meet your orthodontist.There some facial photographs and x rays will be taken,also the over all condition of your gum and supporting oral tissues will be evaluated by your
dentist then final decision can be taken regarding its treatment.
Therefore please see your dentist,and do not delay as age is an important factor in ortho treatment.you can also discuss about your insurance coverage with your dentist.
Hope it helps.
Thanks.
Take care.