What Causes Lack Of Menstrual Periods?

i am 17 yrs old i have menstural problems i dont mensurate last yr i did for 4 days n bleed a lot now after 6 months i did mensurate again me and my boyfriend tried to have sex he ws wearin a condom but could not insert his penis in me what is the problem wid me? can i get pregnent after dis? he did not cum