You are not that heavy! Be joyful that you are not 21 stone. Or 25 stone. Or 33 stone. Many are. You can lose 2 stone easily and then you will feel so much better.
Here is how I lost 4 stone:
1) Have 3 meals a day, no snacks.
2) Don't eat anything after your dinner, and don't eat dinner later than 7pm.
3) Have no sugar- it really mucks up your hunger signals. a bit of honey is okay and fruit is fine.
4) Most important one- get your hunger signals back. Learn to ignore the ones that are "boredom", "sadness", "happiness", "anger", "routine". Allow your body to get genuinely hungry. Have some tea or coffee instead of eating and see if you are still hungry afterwards- to test yourself. Don't eat just because it is lunchtime, wait until you are genuinely hungry. This may take hours and hours! After all your body doesn't need all that you are currently feeding it. Then STOP the MOMENT you feel content. Not full, just like you have eaten enough to take the edge off the hunger. Throw away any left overs quickly! Or freeze them so you can't go back for more. then busy yourself with something you love doing. Soon this will be a habit and you won't overeat anymore.