This thread could almost be written about me.... I noticed last summer that I rarely use brakes and instead scrubbed speed off with the front wheels. I make a mental effort to remember to use them, but can only manage about three minutes before falling back into bad habits .
My excuse is I started racing with a Procat that had silly amounts of lock & a Futaba 112B with no brakes
AND I do the "push up with the thumb on the stick" thing as well. I have to consciously roll my thumb on to the top of the stick to pull back and it means I never feel comfortable on the brakes. I always apply too much or too little