Welcome. It just depends on you. If you want to wait a little longer, then wait. If you want to try it now, give it a try. It doesn't look like you're in dire need but if you're self concious about it, you're probably really close.
If you give it a try, you will probably love it. I would doubt you'll have any problem with the college girls with a shaved head.
Make sure you are really careful with the sun. If your complexion is pasty white, you defintely want sun screen all the time. Don't take the chance on burning your head!