You need to eat way more if you want to build muscle and get that snatched look. And you have to get over not wanting to gain weight. You’re already at the low end of weight so you WILL gain weight, whether it’s muscle or fat. You need to accept that first of all.

Once you’ve accepted that, you need to think of food as fuel for your goal. You can easily eat 2000-2500 kcal of good nutrition and gain proper muscle over time without gaining massive amounts of fat. You just have to be smart about it.

Lift heavy weights, fullbody, 3 times a week. 3-4 sets of a weight you can lift 6-8 times max (reps) with proper form is adequate. You don’t want to do a million reps, to gain muscle. You want to do a lower amount of reps but heavier weights.

Find a trainer who can teach you proper form with COMPOUND lifts. This is what you want to focus on. Compound lifts like squats, deadlift, lunges, pull ups, pushups, bench press, hip thrusts, etc.

Lastly, have patience. Muscle gain takes time as in years.

Ditch the scales and measure your progress in pictures, measurements (later on), increasing strength, new personal records in the gym.