I strted my period 1and a 1/2year ago. I have neverbeen on an exact cycle, but I had at least one in 2months. This time, I didn't have one for 3months.?

Common. When younger people start having their periods it is not uncommon for them to have very irregular cycles for the first year or two. If your bleeding is very heavy you should make sure you are not anemic. Within about a year or two though your cycles should become more regular. Stay active and eat right.
What's your question. If you were wondering whether or not this was unusual, no it is not unusual. I'm still not sure what your question is. Perhaps you could rephrase it for us.