Which is the best type of birth control?

I have a very irregular period, I have had my period for almost 4 years now and it hasn't changed. I ended my last period on Halloween, and just started today. That is a 47 day window, and I also am a virgin so it's not that I was pregnant or anything. I want to regulate my period with birth control. I have also heard that with periods as irregular as mine it's a sign that I may not be able to have children in the future. I need major help!!!