I'm not really sure, but I think it has to do with width of the maxilla, body fat, pronounced cheek bones, and skin quality/elasticity. It seems people with low body fat and wide maxillas don't get those. E.g. Look at cyclists or swimmers who have zero body fat. They rarely have those lines. In your photos, you're in shadows, and that accentuates it. If you take the same photo in front lighting it would bleach out your face and those lines. The weird thing is having good cheek bones seems to accentuate the lines because there is a natural dip from the cheekbone into that nasolabial area. But anyway, you look normal/good and I wouldn't notice those lines in the real world. My suggestion would be to lose some body fat, within healthy limits of course, eat well, drink a lot of water, etc.