OP, your post is not all over the place, and neither are you. One thing I find so common in people in their twenties is comparing their one life to everyone else's accumulated experience and finding themselves wanting.
You haven't fallen behind. Give yourself credit for what you have achieved.
- You have studied for the top level of academic degree. That is phenomenally hard to do. You don't say if you got the phD or just worked towards it - but both are commendable.
- You have saved a lot of money so you may soon be able to buy somewhere. Lots of people never reach that level. Certainly not aged 30.
One thing that is immediately within your control is your health/fitness/weight. I'd focus on this. Exercise daily, eat a very healthy diet and restrict calories slightly to achieve weight loss. This will put you in a better state of health for getting pregnant and for feeling confident about finding a partner.
Don't assume you have to find love via OLD. Just get out in the world. Do lots of different fitness classes - weight training, yoga, dance, hiking, park run, swimming. Start with at least three a week. Sign up for some physical community activity too like gardening or helping at a scout group. Not to find love, but you never know... friends of friends, brothers of friends... fellow helpers... Just widen your net and be engaged with life.
I'd hold out for a flat of your own, not shared ownership. Keep looking every week. Both my DC managed to get on the property ladder by being obsessive about looking until they each found a place that fitted their needs and was a bargain in comparison with most other places.
You have ages to become a mum. I had DC at 39 and 40. For now, allow yourself to do some living.