OP I wanted to give you some experience from my side and @FindThatThing Sorry that you do not feel you are getting the advice you wanted, I hope this helps.
This is my experience, I have been very happily single for a long time. I grew up in a very happy household. My Mum and Dad were very much in love, rarely argued. They weere loyal, kind to each other, cared deeply for one another and were still holding hands until the first one passed. I came to realise how much of a blessing this was for me because I took this to be the bar I have to use for all my relationships. I learned that I am not prepared to compromise and settle for any relationship, not just with a partner but also with friends.
This is not just learning from my parents but from personal experience where I felt I was putting in all the effort and allowed people to take me for granted. I am not sure what age, this hit me, I was, probably in my 30s when I put a stop to it. I now have a very small group of friends but every single one of them is loyal and kind and I do not even think about looking for a partner.
The problem, I see in many people’s relationships, is that they started relationships to fill a void rather than have that person making what is a great life even better. I see in my friends that most of them are in second marriages and they did not take the time to learn from the first time around. They are not unhappy marriages but they're marriages where no one bends for them. The marriages work because my female friends do all the compromising. I am just not prepared to do that.
If you truly want to work this out then it is a dig deep situation you really have to go inside yourself to understand why you don’t feel whole without a relationship. If you have the budget then some kind of coaching could help you work towards how you can be blissfully happy on your own. If not, there are a ton of amazing podcasts, books, YouTube videos and TikToks on mindset, rewiring your thought patterns and improving your self-esteem. Even the simplest act of writing a gratitude journal can make you stand back and think differently about life.
The best advice I could give to anyone who is struggling with being on their own is to find a way to be happy alone. Work on your self-esteem, your boundaries and truly understand what sparks joy for you. If you are looking to get into a relationship now because you feel lonely, I would put a ban on it for six months because you are maybe looking for the wrong reasons. Use that time to work on yourself. Make a a commitment to do something every day that excites you and is about putting yourself first even if it is as simple as sitting in silence and having a cup of tea.
I had a friend who did this, she got rid of all of her dating profiles, she said no to random dates, she worked on herself, she learned to enjoy being in her flat on her own, she would take herself off for the day and she travelled. She felt like she didn’t want to be in a relationship, she couldn’t imagine it, she was happy alone. Then this wonderful man just walked into her life. She kept him at arm's length for a long time, she was brutally honest with him, she let him in very gradually and she has not compromised since they have been in a more serious relationship and it is working.
Work hard to be happy alone, there is no one route to this it will be different for everyone but it will save a lot of unhappy hard work in the future.
Good luck and I wish you lots and lots of happiness