need advice!

okay, so i've never posted on here before like this but i need advice. my cycles are always extremely long. ill have a period for like 5-7 days and then it'll stop and i won't have another one for like 45+ days. but now it has been 50 days since my last period started. i'm not cramping and my boobs aren't hurting. i keep waiting on it to just show up, but no signs of it yet! does anyone else have cycles this long? what could be wrong with me? i'm open to any opinions or suggestions. thanks guys!