I also started when I was 14yrs old. I had crewed for my neighbor who was 17 on his Hobie 16 and got really interested in it.
So... my dad bought me a 1980 Hobie 14 for $500 in the late fall. So all winter I read: Catamaran Sailing - From Start to Finish by Phil Berman. The next summer I was sailing, making mistakes. Luckily there were a couple of older guys on the beach that were very nice that showed me a lot of tricks. Then, of course the local Hobie fleet helped a lot too.
Spent 3 years on the H14 and I bought a Hobie18mag... then after a stint with a H17, I ended up with an H14 turbo.
I say go with the H14. Just plain fun!