How to get rid of a double chin?

It really bothers me, its not even that much but like its totally there when you look at me from the side and when I talk and especially laugh.
I got to a point where I dont even wanna stand next to someone and I always try to cover it up when I laugh and it just bothers me what can I do to get rid of it?
I'm not even fat or something I just have this double chin that pisses me off, my mom does too and my sister and they're both pretty thin as well. 

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