Re: No More Period
I had funky periods when I was 16 too, though my record for how long I went without bleeding was only 4 months (which I hated because it was during the quarter I had swimming in gym class and I'd have given my right leg to say I couldn't swim because I was bleeding).
I never found out why they did that. I just chalked it up to being a teenager since your periods are likely to be whacky when you're a teen. Then they went back to normal all on their own and stayed that way for about 8 years.
Infertility is doubtful, though you could have something that can cause fertility issues. Do you have any pain anywhere? Sometimes ovarian cysts can cause irregular or missing periods and not present any symptoms. Unfortunately, I haven't yet patented my device that allows diagnosis online, so I have to echo the rest of the folks here and suggest seeing a doctor for a well-woman exam.
A gyno will figure out what's going on and will discuss treatment options once they know. If it turns out to be nothing, you can probably go on Provera, which are hormone pills that are meant to start your period.
Best of luck to you! I'm having some weird menstrual issues myself and it's not fun.