I hate my quiet personality. How in the world do I change it??

I used to be chatty. Then all of this junior high school drama happened and I lost my friends and went to a new school for my high school career. I have made new friends but I just don't talk. I feel like I have so much I want to say. I feel so boring I want to be the "awkward silence" filler again. I don' want to be the causer of it. How do I do this???