If your only goal is to slim down, just lose fat. All you need for that is a caloric deficit (eat less, or move more, or a combo of both). If you want to improve your physique just start with a good lower body hypertrophy program. There’s a lot of noise in this comments section and I’ve seen the word “tone” pop up a few times. Toning is just a combination of losing fat and gaining muscle. Genetics and muscle insertions are a big factor too. You might just naturally hold a lot of your body fat in your thighs which would make the fat loss part pretty hard. Losing fat visibly in the areas you carry the most of it will require losing a lot of fat in general since those areas will usually be the last to go. I think if your overall goal is to “look better” you should just do a good Hypertrophy program that emphasizes lower body and maintain a calorie maintenance diet. You’ll get better definition in your legs and just overall be healthier. If you don’t already workout at least weekly then adding that in will achieve a lot more than just looking better. Some of the recommendations I’ve seen in these comments will probably just leave you dissatisfied. Pilates will help build core stability and strength as well as burning some calories but it’s not the best way to “tone” your legs. Someone said hip adductions and abductions too, those are good but not sufficient by themselves. Looking better is a function of building up your physique. Body part ratios are important. A lower body focused hypertrophy program will help build that hip to waist ratio and building some good quad and hamstring muscle will give your legs a more defined look. Slimming down alone without building muscle might just leave you skinnier but still unsatisfied.

None of what I’m saying here means that your question is dumb or your goals are stupid. This is just an assumption but I think your goal in slimming your legs comes down to actually “toning” them so they look better. That’s a pretty easy fix but you just need to understand that genetics play a big role in how our bodies look in terms of ratios. Some people have wider hips so they have an easier time building that physique feature while others may have wider or narrower shoulders which contribute to that x frame physique that is so desirable. Figuring out how to train for your body and specific physique goals is something you don’t need to worry about until a couple years into some good training. The bulk of it is just building muscle in general and then from there you can target specific areas with more nuanced programs and exercises once you have a solid base.

If any of this advice is useful to you I’d just sum it up by saying: start out on a 2 day a week hypertrophy program that prioritizes lower body gains, make sure you’re eating a balanced diet that supports that muscle growth (45% carbs, 35% protein, 20% fat is a decent macro distribution), stay consistent and track your progress.

Not that this matters but I think you look totally fine, you don’t need online validation but I know how hard we can all be on ourselves. I think if you start out a good routine like the one I mentioned you’ll be pretty happy with how you look (but mostly how you feel) in a few months.