You seem self aware and admit that being alone is hard for you.
Now, is not being okay sitting with yourself a bad thing? Maybe...but if you have the wherewithal to recognize your own thoughts, habits and upbringing then I don't see how it is a problem in this exact instance? The only related issue I think of would be becoming overly attached to others or codependent.
I had a friend who expressed a similar sentiment to the one you do.
He was constantly in relationships and could not spend a night alone with himself. He would go down the list of every friend and acquaintance and reach out to anyone to keep him from his solitary thoughts. Many of his romantic relationships were toxic. He eventually found a girl after jumping ship from one that stabilized him. It was a healthy successful relationship and the girl actually encouraged space between them. It has been a few years now and they are getting married and have had no notable issues from what i've seen.
The point being, that when the right person shows up and you synergize well, might as well let it ride.
If you've been in past relationships which brought about baggage, trauma or whatever else (your name speaks volumes here lol) then you more than likely learned alot about women and yourself. This friend of mine faced criticism from other mutual friends about his relationship hopping and several were concerned with his inability to be independent. Well, he took heed of what was said and pressed onward and it worked out. Another friend of mine who is about the same age as you knocked up a whack job at 21. A month after their divorce he met a new girl. Now years later, they have three kids together and are doing great.
Anyways...
If you find yourself questioning these things, I would then try to force yourself to sit with these thoughts. Recognize patterns in your behavior and assess as needed. If your friend is chewing your ear off about it then maybe there is some weight to his words if you trust him but,
you likely know yourself well enough as a grown man to come to your own conclusion.
And if there are self doubts? Reflect and challenge them. I personally enjoy being solitary for the most part, but if I were in a healthy relationship I wouldn't throw it away or have second guesses. If the relationships serves you then by all means address your issues as best you can while remaining in said relationship. That's what I would do.
Loneliness is not a new experience, but it is one that seems to be increasing as time goes by, especially with the recent pandemic lockdowns, social media,
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