For me, there's probably two areas that i feel most frustrated about regarding singleness. The first is the sexual arena; I've been told I have a high libido, and to be honest there's so many times when I crave that closeness. I'm not just talking the physical aspects, either; I mean the whole package, mind, body, and spirit. It's not just a desperate desire to "get laid", in and of itself; it's wanting ot be that close with someone who honestly loves me like I love them, and knowing that isn't possible (right now) frustrates me a lot.
The second is probably a lack of everyday "bonding", and what i mean by that is the chatting, hand-holding, confiding, trusting, etc. There's so many areas of my life where I often feel so alone, and while I love God very much I keep thinking, "Is it so much to ask for someone who has skin on them?!" Its really difficult for me sometimes, to trust God when I can't see or hear him. My prayers often feel so one-sided or hollow, and I don't always know what to do about them. In my head, i know so much about God, but in my heart I just feel so depressed and empty a lot of the time. I want that "inner peace" and joy that some Christians appear to have, and I get upset when I can't "sense" or feel God's active presence in my life.