You came on the right place. We made an app in which we put all our experience and knowledge about exercising and dieting. If you stick to our guidelines you will achieve your goal. But remember, be patient and persistent. Do not neglect any of the main points of our program, neither workout, nor proper diet. Do not rush, you are still very young and you have enough time for great six-packs. When you finally get them, you can use our plan for maintaining abs.
Here's the link to it - https://www.steadyhealth.com/ab-workouts-for-men-and-women/
Good luck, and I hope you will soon be satisfied with your body.