Hi, I'm 20, and scared!

Lateley my Right testical has been hurting me, it's painfull, everytime i move it or touch it, stand or sit, it hurts me, feels like it's been pushed up and stuck in the air and can't get down.

Also what i've noticed latley it that it's bigger compared to my left testical, and it's got a spot/lump on it, which kinda looks like a very sharp vein sticking out, i'm not sure what to think about this, i'm not sure if it was like that before or not..

Should i see a doctor? is it nothin to worry about? please tel me it's nothing to worry about, i'm scared :-(

Also, it hurts allot more whilst i'm sat down smoking..

Please reply, thanks.