Omg Im scared! testical cancer? :( help!!!!?

ook well i noticed a bump in my testicular like a month ago and I hoped maybe it would go away..well now it dubbled in size and it feels like a bunch of soft bumps(they all feel attached to eachother) were that cord in your m is. There is no pain at all... I havent noticed anything different about myself other than the lump(s). I noticed that my left testicle were the lumps are has seemed like it has gotten smaller than the other one... I herd that it might be testicular cancer.. im so ******* scared and now im stressed. what should I do.?? im only 13!!! what do you think? :(