Fat deposition on someone’s body is unfortunately pretty genetic. Meaning your body will preferentially store fat in certain areas over others and also lose it in some areas over others. It’s also gender related as well. Men tend to store excess fat preferentially in the belly and love handles areas, whereas women will preferentially store in the upper leg/hip/glute area. Everyone is different but these are general observations.
Hopefully this doesn’t come off as insulting so please don’t take it that way, I’m just trying to help educate. If you are thin but still have areas of pretty considerable body fat, you are probably what is referred to as “skinny fat”. This means although you don’t weigh a lot for your height, you have very little muscle mass (which is heavier than fat). The good news for you if this is in fact the case, is that by adding muscle through strength training, you will add heavy, metabolically active tissue that will help gobble up that remaining fat you have.
If you don’t have a lot of muscle, trying to diet away that remaining fat pad will not leave you in a good place. You simply may not have a big enough “engine” to burn that fat off. You don’t even have to go crazy, good bodyweight excercises like push-ups, pull ups and squats can get you a lot of muscle in a short time if you haven’t trained before.