wait till your 40 
I was fine until 32 or 33... then boom it hit me. Honestly, unless you're born with a really ugly head... if you have some muscle and you're lean, the shaved head look works for most.
Anyway, once girls turn 30, they place a full head of hair about 9th on the list of things they want. Stability, incom, provide/protect, good in bed, want kids, dont cheat, etc... Those things are way more important to them.