Congrats on the progress ...not gaining is PROGRESS!
And even more, congrats on cutting out the fast food. That stuff will kill you faster then being overweight will. And congrats on starting the process when it's only 20#s and not more. (I was a slow starter
My suggestions are to weigh or measure everything you eat. Everytime. And then track it. It's funny, when I bake I can estimate accurately what a cup is etc but not when I'm eating it.
Increase your exercise to 6x week. Try the videos here on spark. They are free and vary in time. Try a 15 minute cardio workout one day, a core workout another, an aerobics video another day etc. You can also see workout videos on YouTube. Switch it up with High intensity training, walking, biking etc. Keeps you from getting bored and from getting too comfortable ( means lazy)
with a routine.
I try really hard to not have junk food in the house because I know I will eat it ...all of it.... especially chips.
Instead I keep carrot sticks, hummus, celery, low fat cream cheese, laughing cow cheese (low fat), apples, grapes, watermelon, salad chicken, salmon and steak in the fridge. I'm more likely to eat salad if I have a bowl already made and then I add protein.
I minimize my carbs as your body will make what sugars it needs from everything else you eat. Also, carbs make me sleepy and stodgy and I don't want to exercise after eating them.
And remember to celebrate your successes. Not eating chips for 1 day-Success! Exercising today--Success!
Set mini non weight goals and reward yourself....5 days of no fast food = a pedicure. 4 days of no chips = a movie. Use whatever motivates you.
You can do this!