I'm sorry to hear about your situation, I'm 21 and whilst I've barley experienced much of my twenties life does get weird in this stage and there is definitely a lot of figuring out to do, a lot of people have said being in your 20's is like experiencing your teen years all over again. It's alright if your life moves at a different pace then others and if you learn things a little later, but the best thing to do is keep moving forward and finding ways to improve and make your days brighter.
You sound like you've done really well for yourself so far, gone to uni, got a job and even travelled; Well Done!
In regards to having more people around you and improving your life there are a number of ways to pursue this;
1) By pursuing religion - it doesn't matter what religion you have, but during the times of difficulty, it can really help one stay grounded. You'll definitely be able to connect with others by going to your place of worship more regularly and it will perhaps help you find peace, it'll be great for your mental health too.
2) Get Active - This will definitely be great for your health (mentally and physically) and it doesn't have to be anything hardcore it could literally be a walk in the park or going to a few gym classes - through this you'll also meet so so many new people and friends! Definitely try to spend more time around nature - it's good for you!
3) Hobbies - it could be gaming, going to conventions, anime, art galleries, book clubs, cooking classes, concerts or absolutely anything and by going to events for your hobbies you will definitely meet new friends to socialise with and fit in with.
4) Spending time with family and friends will also help to improve your mood and help you feel better.
It's also worth continuing to go on these dates to help find the right person for you along with attending your therapy sessions. I genuinely wish you the best of luck with things and i don't want to be that person but eventually things will get better, it might take a while or maybe even quite soon but you'll get there. Your mind is like the sky and you're experiencing some cloudy weather, but even the worst of storms will pass and your skies will become clear again. Don't worry about feeling 'behind' because frankly you're not, it's just you being negative in all honesty - stop it. Stop doing that - and be kind to yourself. Your emotions are valid and I hope some of the advice I've given can work for you. Just because you haven't found someone to connect with doesn't mean all your other experiences are for naught, think of it this way; all these people who have come and gone in your life were all a part of your journey to get where you are now, like npcs in a game - you're the main character in your life and people can get lost at times, but don't let it weigh you down - it's okay. you've undeniably done well and life isn't simply about accomplishments. I've heard someone say ' insanity is doing the same things over and over again and expecting a different result each time'. If your life is bothering you then definitely try new things and don't hold yourself back.
(Personally i've found youtubers like; 'Better Ideas' and Ted Talks in general help me find clarity in a situation)
I hope you feel better soon and find what you're looking for.