I am 13, I am a bit short for my age and have never had a serious health problem until now. Last week I found a small lump on the top of my testicle. I didn't say anything for a while but last night I came for the first time and the semen was a purple ish blue. Now today my testicles are sore. I know I need to see a doctor but how do I tell my parents and what do you think is happening to me?