What should I do when someone tells me to eat less and exercise more, even though I'm trying hard for a long time and it doesn't seem to work?

 If they are well meaning people, you are lucky to have someone like that. Ask them if they will accompany you on the exercises. Find out if they any tips of how they have maintained healthy weight as well as how they fit in exercise into their schedule.

If you are on the quest to adding more exercise and watching what you are eating, you are on the great journey of wellness. Now its just a matter of swapping different things and see if theres any effect.

Know that this is a process. Do appreciate any good thats come of the change in lifestyle. Add protein and healthy fats to your meals. Review your exercises. Try different types of exercises. Have Fun.

Let me know if you have more questions.