I keep reading that taking herbs young might disrupt any growth that you might be capable of achieving later on, but what about oils like flax or evening primrose? Will these do the same thing?

EFAs are great and I can't see them negatively affecting your growth. I would skip EPO, though, as some women experience breakthrough spotting/bleeding or changes in their menstrual cycle. Flax should be fine. :) A source of good dietary fat is great for overall health. Fish oil (high in omegas) is oftn given to kids with great success. If you want to know more about these fats, check out:

http://www.udoerasmus.com/firstscreen.htm

Hope this helps!

Oh, thank you so so much! I was afraid to ask but I'm glad I did. You've been very helpful to me. Thank you for your kindness.

borage oil is another good one.
flax seeds come milled; they're great to sprinkle onto your salad or cereal
also, eat your avocados and nuts - they're full of essential fatty acid goodness