Im fat and goin to have with someone. what will he think?

From experience (a guy who has been with 2 plus sized girls) i can tell you not to be worried at all. Guys are visual and chances are key areas that we look closest at are larger. Guys often like to see things shake as well so feel confident in that. Outside of that you should know that a lot of times bigger girls have pretty faces and guys are attracted but always too insecure worried about what so and so will think. He'll have with you and will continue with it more than likely but don't expect him to up and want to be in a relationship with you... at least not an open one. Trust me, if you were big to the point where you were unattractive then he'd decline the offer