I cannot tell you what the future holds for you, but I can tell you that millions of people share your fear. However, studies show that about 95% of people get marred by the time they're 55 years old. I know you'd rather not wait that long, but at least you can rest assured that only 5 percent of the population lives that long without having been married.
I can't tell you what the future holds for you, but I can tell you that many people see marriage as the solution to loneliness. It is not. In fact, if a person cannot learn to be content living as a single person, I highly doubt that marriage will cure their discontent. Indeed, the idea of being loved unconditionally is appealing. But while a person is single, it is more important that he or she learn to love others unconditionally, beginning with one's one friends and family members. If a person does not experience love at home or with friends, then marriage is not the solution. The solution may be to find better friends and to work on healing one's family issues. After all, you can't build one family upon the ruins of another. If you are able to practice loving others and you surround yourself with those who do care for you, then the single years of your life will not seem so lonely.
In the meantime, do your best to look beyond yourself to serve those who are far lonelier than you may be. If you notice, the happiest people on earth are those who forget about themselves. The saddest people are those who forget about others because they never stop thinking about themselves.
Lastly, if you do feel called to marriage, click here for some tips on how to find a decent guy.