I want to become more outgoing

So Ive been the wierd quiet kid for most of my life and i always felt freightened of social situations. Despite that im in desperate need od friends. My classmate said that i often seem really distant because i dont talk much and wear headphones most of the time. I dont want to put people off from talking to me so i think i need to change my behaviour a little. Im already thinking about joining some after school activities this year but the problem is i get really nervous talking to anyone and i just end up embarassing myself. Tried talking to the more quiet People but they didnt really seem interested. PLEASE HELPPP