Receeding hairline at 18?

A few months ago I started realizing my hairline looked a bit further back at the temples than it used to. My grandpas are partially bald but they are in their 70s+. My hairline has always been far back but now there are tiny hairs around the edge which don't seem to be growing. I started taking saw palmetto and vitamin supplements with b6 e and biotin to strength hair, but it is to soon to know if they are working. I heard stress can cause it but would that be just at the temples or all over? I also started messaging my scalp to increase blood flow to allow vitamins to reach my hair follicles. I don't want to take procipea or rogaine just yet.... Any tips? I wish I could make it stop because I love my hair and I've never really had a gf and I think premature balding will even lesser my chances....