Hi. I witnessed a small dark spot in my sperm three weeks ago. I got to know that its blood when i surfed over the internet, then i got scared. but still I didnt got any pain. I checked it thrice after that but i didnt found such a thing again. But yesterday i again found a small dark spot in my sperm. I really scared a lot this time. This time i also felt some pain in my testis area. I also checked myself but i didnt find any lump in my testis area. I didnt experienced any other issue like problem while urination, fever, nothing.I aware that there is no blood in my urine.I never had sex, so i also aware that this is not std. I have no idea what is this.. will this make me infertile or something ... As i am overseas student i have no idea how to consult a doctor(I am poor in understanding english slang over here). Could some one help me by giving a brief advice. please

Details about me- I am 24 years old men. usually mastrubate 4 to 5 times a week. smoke 5 to 6 cigarretes per week. drink beer or wine once or twice a month.

Until 7 months ago i usually rode bike in most of my time, is this might be the reason.