I feel invisible and unattractive and deeply lonely.
And this can be so common and so, so normal.
It’s been 7 years since I had my first baby and I still feel unattractive because of the changes it caused to my body.
I had the opposite problem though that I didn’t want my husband near me because I didn’t want him to see my body, so it’s really positive that you are trying to reignite your sex life and that you still want that intimacy with him - that’s a far better route to take than the opposite one.
There is no ‘normal’ about when sex should resume.....I remember my friend telling me that by 4 weeks post baby she and her husband were absolutely gagging for it....and I felt horrified because I just couldn’t relate at all.
Even if nobody on here can fully see things through your eyes you are clearly upset and missing your husband and those feelings are so important to acknowledge.
Could you ask FIL to watch the baby so you and DH could at least go for a 30 minute walk or something? Holding hands, arms around each other, talking about important emotions etc, it could even turn out to be something intimate.
I wish I had the answer for you OP, I hate to see people upset (especially new mothers) so I hope you and husband manage to find a way to resolve your insecurities and find a way forward 