Picc Line

Hello i am 17 years old and have been diagnosed with hodgkin's lymphoma. Everything has happened extrememly quickly and i do not think everything has hit me yet. I have started chemo last wednesday however before i started there was no appointments for picc lines so my first chemo went through a canula. This caused alot of pain for one of the drugs i had and has made me nervous for me chemo. I have my picc line fitted the day before my next chemo and i want to know is it worth it. As i get closer and closer to the day im getting more and more terrified about having it fitted. I cry all the time (which sounds childish) because im so scared. Im scared about it being seen by people because i will be wearing t-shirts. Will i feel it like a normal canula? Will it hurt? How visible will it be? Can i sleep on it?