I've been told that there's no better time to do something you've always wanted to do than when you are single. So if there's a goal, dream or hobby that you've been wanting to do but haven't done it yet, do it now! Because when you are married, you won't have time or maybe even money to do what you want to do.
If you have kids, then you will always come third. Your spouse, your children and then you. (I say spouse first because some people say we should put our kids first, but what is best for the kids is for their parents to have a stable marriage)
So think about that. It's not easy being married, I've never been through it, but I've seen my mom go through two unsuccessful marriages. It's tough and if you're not ready, it's best not to jump into it. Movies and television will tell you one thing, but they are only showing you the good part. There's a lot of sacrifice to marriage. A lot of sacrifices that you don't have to make right now that you are single.
So please enjoy your singleness. It's a great time to develop your relationship with the Lord and really only he can cure loneliness.