If you cycle before your HPTA if fully developed then your chances of having ED symptoms will be significantly increased. Even if you don't have problems soon after PCT it raises the odds you will have problems later in life. I'm not saying this to scare you, it's the truth. There is usually someone your age posing on here every other week that they have issues after cycling and need advise. Read for yourself, the link below has a few examples.

***Cycles going wrong for the young***