How can i prove to people that i am not as shy as i used to be?

the other day i heard my college tutor talkin 2 my mate bout him leavin and i heard her sayin that i was mostly goin 2 go bak 2 bein shy and not speakin 2 any1lyk i was last year just coz he aint guna be there no more i fawt i was more confident this year but she obviously thinks i cant cope on my own without him. how can i prove her wrong and make her realise that i dont need my mate just to show that i am confident? help me please many thanks in advance