How bad is my receding hairline? should I be concerned?

Hello, I am 18 years old and very insecure about my hairline. I have been shedding ever since I was 8 or 9 years old, but recently I've been noticing my hairline has been receding. It's been a very slow process. I've been to doctors when I was younger and they didn't seem too concerned about it, but now I'm wondering if I should revisit a different doctor again.

https://scontent-sjc2-1.xx.fbcdn.net...f4&oe=590467B1

https://scontent-sjc2-1.xx.fbcdn.net...a5&oe=59046B21

You don't even post a picture.