If you give up now where will you be in a year? At the same spot you are now, feelling crapy or crapier because you didn't stick to it... If you continue, you WILL feel better about yourself, even if you lose only 10# in a year, that's 10# less than you are now... Sometimes too our whole internal body needs to adjust to the new excercise routine, new foods... Hang in there if you keep plugging away it WILL eventually show. Take up a new exercise, belly dancing, dancing, jogging, swimming, anything!! Have fun ...
And hey, you've lost 20#, that's 20# that you were carrying around last year that you have don't have anymore...
Hang in there