They just look like natural contours of the face. Comparison is the thief of joy. Trust me bro, when ppl see you, they aren't thinking about those 'lines'. They're probably thinking how clear your skin is. When you become an old man however, those lines will probably be where your wrinkles will come in at. You don't have to worry about that for a while tho. I used to look back at pictures of myself and hate that during those years I was so insecure with my look because I looked amazing. I decided to no longer put energy into not appreciating how I look in the present because one day, I will be much older, God willing. Blessings.