I agree with most of the comments made by other responders in this thread, and have a few of my own to add. Most of the guys you're probably dealing with are either confirmed bachelors (of whom there are more every year), or divorced guys who've been burned in one way or another. By your age, the "good" guys have long since been vacuumed up. That's not to say there can't be "good" guys among those bachelors or the divorced, but men in both those categories need special treatment to become "good" guys.

The confirmed bachelors have some kind of problem (large or small) with relationships and family. That's why they're bachelors. Something in their background turns them off on relationships beyond a certain limit on intimacy, beyond their comfort zone. I would guess that gals in your situation have to devote some time to sniffing out, probably indirectly, what has the guy scared of getting as close together as you'd like. And then doing something, quietly, unobtrusively, to reassure him on that point or those points. Before he has a chance to run away.

The divorced guys may, for all I know, be somewhat easier. They obviously had an unhappy relationship. And here, again, you need to snoop around and somehow figure out what his problem was in his marriage. Why he's divorced. With divorced guys this should be reasonably easy. At the right time and in the right place most divorced guys LOVE to talk about their ex-spouses and how bad they were. And you have to position yourself as the Un-Former Spouse. The different woman. The one who wouldn't DREAM of doing what Former Spouse may have done.

If you take the whole pool of available guys for your age group, and if you subtract the confirmed bachelors and divorced guys, I don't know that you'll have many left. Anyone reasonably comfortable with marriage and family is usually spoken for by their early thirties. You're dealing, mainly, with two special groups. You might even want to do some research on these two groups, their psychological characteristics and other factors relevant to turning them into good and decent boyfriends and husbands. I'm sure it can be done. It's just not as simple as looking for good guys when you're 21. Take care!