Don't know how to be confident

So this dude recently started showing interest in me and like wants to maybe start a relationship with me but I am just not confident in myself at all like I'm going thru all these scenarios in my head and I just feel like I'm not good enough for him like his ex gf is so petite and pretty and doesn't wear glasses and like idk I just feel like idk why he's interested in me you know ? And like we literally just started talking like 2 weeks ago and I'm kind of panicking in my head because what if when we get naked in front of each other he doesn't like what he sees or even what he feels like I'm not skinny like her I have muffin top and love handles and everything on my body jiggles you know idk I'm just sooooo not mentally prepared to try with someone I don't think but I don't want to miss the opportunity because he's a really really respectful sweet guy idk