Help :/ !!!!!!?

hey i hav jus started a new job yesturday and everyone is young and are my age (17) everyone knows eachother there an i feel a bit worried i am gona b left out . the thing that could help me wou)ld be to lower ma nerves a be CONFIDENT .. dats what i need help with is there any ways i can boost my confidence (btw im not ugly and not pretty, and i wear makeup and dress fashionably) help .. coz todaii i gotta walk in the staff room and bring myself not sit on my own and join them :/ ... will choose a best answer! n tnx for everyone hu does answers : ) x x