Matured hairline or balding?

[Matt2445]

I asked a question yesterday but got no replies so hoping for some help this time am i balding or is this maturing hairline, im 15 and it would be terrible if im balding already please help thanks( its about 3 fingers from eyebrow to middle bit of hair and 4 and a half fingers from eyeborws to highest point of hairlime on eother side)