So, I got my first period May 5, 2015, when I was 14. I am now 15 and still have very irregular periods. I participate in Track and Cross Country, so I am athletic. I am still a virgin and have never done anything sexual of any sort.

Firstly, when I have periods, they are normally fairly heavy and not very clumpy in the least. When I'm not experiencing the bloody part of the cycle, I normally have lots of clear discharge that has the same consistency as the snot from a runny nose. Is the clear discharge normal?

Secondly, sometimes I smell a kinda funky smell down there, and it smells kinda fishy. It doesn't smell rotten or anything like that, just a little fishy. Although not overpowering, I don't like the smell. How can I prevent/stop the smell from happening?

Lastly, I feel that I should've had a period recently, but it hasn't happened. My last was in late November. Last week, I was having stringy discharge that looked like blood. I had it for four days, but it wasn't a lot or like my normal periods at all. What is it and is it normal?