I'm 25 and I have never been in a relationship for longer than a few months at a time and even then I've never had true emotional intimacy with anybody.
I don't think there is anything wrong with being single, if anything, being trapped in a relationship and tied to another person who you aren't happy with is a problem.
Finally, I find that society has unfair expectations of people, especially women. They expect people to go to school, get married young and have children and they expect the women to put their lives on hold for their families while judging those who choose to live otherwise.
If I could offer you one bit of advice it would be to be yourself. Don't let society tell you how to live your life because they don't own your life; you do. In this day and age, women have more freedoms than they ever had in the previous tens of thousands of years of human history combined. You can be anything that you want so I implore you to not cave into societal pressures and instead focus on what you are passionate about.
Personally, I don't want children and I've been extremely vocal about it and since I live in a area where the majority of the population is Christian, I've been told on more than one occasion that I'm defying God or I'm being selfish or whatever not to mention. I'm also an Atheist and Athests where I live are looked down upon as being evil so I'm certainly an outcast haha

I understand all too well what you are going through.
If you want a relationship and/or children, be sure that that's what you want first rather than simply you finding a way to compensate for another deep seeded problem.