Is a uk size 12/14 fat?

I’m an 18 year old girl and I’m 5’7 and I wear size 12 and 14 depending on where I shop but it’s usually 14 especially on the top, I don’t know why but I feel like I look really fat and should be size 8-10 at my height here’s a pic of what my body looks like, would you consider me to be fat?
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