You said you're not looking to meet your husband anytime soon. It sounds like you envision yourself having a series of relationships that you intend to make temporary. It doesn't sound like you are real clear on what your goal is, other than you don't want to be bored. Building an adult life with adult commitments takes a lot of boring effort. Here is a statistic:

"The average age for Americans getting married has reached a historic high -- 27 for women and 29 for men -- a jump from the 1990 average marrying age of 23 for women and 26 for men." From: 5 Good Reasons To Get Married While You're Young, According To Research

So it doesn't seem that you are too far behind, at all. Looking at your list of diagnoses, it does look like you cope with a great deal of inner angst. That can make it harder for a person to reach any goal.

Some young people are burning with a desire to get married. Some reasonable candidate comes along and they go for it. Maybe that's just not you. I'll bet that almost anybody who makes getting married their deep, burning ambition, which they focus on like a laser, can probably find someone to get married to before they are 28 years old. You probably could too. But you are not just looking to get married at any cost. You want the person to be just right. That can take more time to find. If you are bored by most people you meet, then you are looking at a smaller pool of candidates. You find men to be immature and you find that hard to tolerate. It's probably easier to get married the more stuff you're willing to put up with.

The other side of the equation is what do you offer a potential mate. Lots of people who have all kinds of things wrong with them do manage to get married. They find someone who has a need that they can fill, despite their personal deficits. Maybe they have to sell themselves a bit. Here's another bit of advice from the same article as above:

Research says there's no advantage to delaying marriage just for the sake of delaying it. A 2010 study by sociologists Norval Glenn and Jeremy Uecker states that "A 25-year-old person who meets an excellent marriage prospect would be ill-advised to pass up that opportunity only because he/she feels not yet at the ideal age for marriage.

One thing life does teach us is that you can't have your cake and eat it too. To get A you have to give up B. Sometimes, the desire to keep options open can keep a person in a perpetual state of indecision. Having a hard time with compromise can do that also.

If you have a lot of emotional turmoil that you deal with, you probably need a partner who is the nurturing type and does not have a lot of emotional turmoil of his own. The guy who might make the most exciting first few dates may not be the best choice for the longer haul. It can be hard to accept that, in life, we really can't "have it all." Passionate people sometimes have the hardest time accepting that.