maybe you just aren't ready to settle down yet, or maybe you haven't found the right person. I don't think there's anything wrong or unusual about this especially considering your age, as long as you're honest about it with the people you date.
Ever thought about either just saying you want to date casually with no commitment and aren't looking for a relationship, or having an open relationship, or being poly? That might help some of your problems.
It's not really a numbers game. The more you date, the less likely you are to find the right person. The whole process has desensitized you; you have become addicted to the honeymoon phase, you're in love with a chemical phenomenon. I see this all the time with people who date a lot: they often end up confused about why they're not "happy" in the long term sense. But by then, they're usually too far gone.
Take a hard look at yourself, your needs, your behavior,and quit your addiction. Next time you feel like dating, either go for a no-strings-attached thing or wait three months (yes, three months) for the "high" to wear off before you can make a rational choice to pursue a relationship.
Maybe casual relationships are the way to go for you at the moment.
I have been in that position as dating can releive the lonliness so it fills that gap. yet being with someone presents a whole lot of new problems.
Its like there is no middle ground quite literally.
If i get in a relationship it feels great at first but they only tend to last a few months before idk the woman starts to cool off lol.