I'm a plus size thick girl and the guy who has a crush on me is a fitness fanatic, I feel a little insecure to date him, how can I over come this?

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So my friend who I will call Josh for the sake of this question has had a crush on me for almost a year but I was dating someone else at the time. He recently revealed how he feels as I have been single for a few months now. I was very shocked and Flattered by this. Its not like I never noticed him but again I was with someone else and it would have been wrong to pursue anything.
Josh is a fitness freak, he has a bachelor's in kinesiology and has his own fitness workshop at his gym. He stays very healthy and is just in great shape. Now me, I'm a pulse size thick girl and in the past few months I actually gained weight do to stress from school and a health issue. I feel confident in myself as a person and in how I look at times. I have been in better shape and I have days were I feel less attractive, I'm only human.
Now mind you Josh has seen me look my best and my worst, he has seen me in a dress and has seen me in a swim suit. We have a similar circle of friends so we hanged out often.
I haven't seen him in a few months and we have our first date tomorrow.
I just feel slightly insecure cause he is how he is and I am the way I am, he could have anyone he wants and he wants me I guess I don't fully know why.
It makes me insecure and slightly worried, jelaouse that someone else could come a long and just distract him. I am slightly afraid to fully pursue anything because I feel like he is out of my league.
I'm not sure how to emotionally fix the way I feel I know it's a me thing and it's in my head, I'm not sure if this is something I should talk to him about when I see him.
So to all the fit, slim, Furness freaks out there how do you feel about pulse size women and how do you feel about dating one?
I'm a plus size thick girl and the guy who has a crush on me is a fitness fanatic, I feel a little insecure to date him, how can I over come this?
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