I don't wish I looked like a 19-year-old, Ormirian, and you look ten times better than me! I went through a phase of 'minding' that I'd lost my looks (or, rather, that my looks no longer gained the admiration of strangers) but it was pretty short lived. I'm now having fun with my new appearance - veering from smug social invisibility to loud experimental outfits - and LOVING being much more outspoken!
I always was outspoken, you know. But nobody paid attention when I was pretty. Maybe I'm more ruthlessly outspoken now, who knows? It's good, though 
I am heading, very deliberately, to a state of glorious eccentricity. Like Jenny Joseph's poem, only more so! Give it a couple more years; you'll see 
Menopause is as disruptive a transition as puberty. Just as puberty triggers self-doubt and a changed identity, so does menopause. The fact that societies (logically, if you're reductive about it) value women of reproductive age more highly than non-reproductive women and girls becomes a matter of interest and detachment.
The arthritis, rheumatism and weakness aren't going to be as much fun, so it'd be a shame to waste this bit by wishing you could wind back the clock.
Sorry if this has seemed shallow or something; it could do with lots more discussion imo, but all my attempts to do so end up with people posting about anti-ageing regimes and/or grandchildren.