Huge Congrats on a job well done
People respond to what they see, and to (often) the most superficial thing there is to discuss. So you lost a lot of weight and look great and that's what they are going to comment on. Maybe their comments remind you of your old way of being, which you want to forget about, which is understandable as you've given yourself a new life, so to speak.
Don't make up false complaints about your life and don't build up on whatever you have in your life that's negative. Acknowledge the great place you're in, and change the subject. Keep redirecting the conversation to about them, and if they bring it back to you, smile and tell them how great things are. Unless you're with someone very close, there's no benefit to you to hash out your personal problems to 'sightseers'.
Enjoy your well-earned success and stay healthy in body and spirit.
