I still feel jealous even though I know it's a normal behavior, am I wrong for feeling this way though?

I know it's a normal behavior for guys to look at pictures of other women but when I see the ones my current partner looks at, I feel super jealous because I look nothing close to them. Like they'll be skinny with a small waist and curvy "where it matters". I'm on the chubby side but he tells me that he still finds me attractive. It's hard to believe him when I've seen the girls he looks at... I'm doing what I can to lose weight and try to look better for him so that maybe he'll see me like he sees them. I guess I'm asking for advice on how to not feel so jealous about it and ways to boost my confidence. Any advice will help, thank you. For reference I'm 23 and my partner is 27.

I still feel jealous even though I know it's a normal behavior, am I wrong for feeling this way though?
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