I hate wasting time on a person, so im very blunt.
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Just as long as you're not overweight and you are healthy I don't see a problem with being confident in yourself. However instead of just saying that you are fat to a guy, why don't you send a pic of yourself (I don't mean a nude picture) and then ask for one of him so you can see what he looks like. This shows that you are confident in yourself without actually saying, "Hey by the way I am fat"1