Exercising your thighs doesn't make you lose fat in your thighs.
Exercising the various muscles that make up your thighs can give that part of your body a nicer, more muscular shape. Squats, climbing stairs are both the kind of exercises that work for this.
Whether you lose weight is dependent on your diet (are you taking in fewer calories than your body needs).
Where you lose fat or muscle (when you do lose weight) is a function of exercise: if you are gaining or maintaining your muscle, then you will lose your weight in fat.
And where you lose fat (if you're losing fat & not muscle) is mostly about your genetics & hormones. For some female-bodied people, the thighs/butt/hips are the LAST place you will lose your fat, no matter WHAT exercise you do.
T does change things up in how your body distributes its fat (or holds onto it), but it's a very slow progression. It seems pretty common for people to not notice anything major until the 6 month mark, at the minimum.
Anyway, keep eating healthy/clean, keep doing more fat burning exercises (which means high intensity interval training & resistance training, NOT steady state cardio), and eventually, you'll see a real difference.
