Sending you a hug! I’ve just turned 33, but actually I do still feel very young. I don’t have children, but I feel like the rest of my 30s is full of possibilities and adventure. Where I have lived (London, and before that New York) most of my friendship group/ wider circle don’t have children until late 30s at least.
I had a great time being 32 - had some of the best sex of my life, ran a half marathon, worked hard and now feel like my career has really clicked, and planned lots of trips with friends. I like planning monthly activities with different groups of friends - like, a group of us go on a hike by the sea once a month, a group of us who want to improve our Spanish all have a dinner where we just speak in Spanish once a month. These are all groups that have grown organically, by the way. Not a fixed friendship group - people just bring people along who they think will enjoy the walk/ dinner. It’s been a great way to meet people.
You say you’re not sociable, but a monthly arrangement can really help with this. Have you looked at things like volunteering opportunities where you live? What about learning a language or going to a weekly dance/ yoga/ fitness class? I find a sociable act begets another sociable act.
In terms of looks, I’ve been getting grey hairs since I’ve been 20, and I can’t be bothered to keep up the maintenance of dying them (when there are so many other more fun things to be doing!), so I just leave them and have stopped worrying about them.
Skincare: exfoliate once a week, use SPF, a daily moisturizer and a thick, unperfumed night cream before you go to sleep. It doesn’t need to be an expensive one. I use the Nivea almond oil one.
Drink lots of water, and eat lots of fresh fruit and veg.
Basically though, I think you need to meet some other people your age who don’t yet have children. There are so many ways to do life, and so many different timelines. Also, try reading the book ‘Dear Dolly’ by Dolly Aldterton. She has a lot of very uplifting advice on this topic.
Honestly, there is so much in life to look forward to and enjoy! I think you need to have a think about what makes you happy, and do a bit of working out how to get more of that in your life. Good luck!