Advice: can't conceive ?

Kg
I am 23 years old, I have add irregular periods my whole life, I can go from having it every month to not having it for 3-4 months or longer. I am trying to conceive and no luck. With me not having my period does this effect me ovulating and conceiving and if so what should I do. Please respond any advice will help also if you are going through the same sisuation Thank you