I know what you are feeling, because I did not really date in high school, either. I had a few dumb physical relationships, and I beg you: do not give in to a shallow relationship in order to pacify your desire for a real one (like I did). Stay strong. I also wanted a deeper, steady relationship, but I guess I was a bit shy with girls. Plus, I went to an all-guys high school and that didn't help. But looking back, I realize that although that time was difficult, I really avoided a lot of potential problems. I was able to get to know girls on a basis of friendships, and that ended up being a better foundation for love than anything when I did start dating in college.
Sure, the loneliness is there. I think that's natural. Sometimes when classmates all around you are jumping headlong into intense relationships, you get the feeling like you're moving too slow. The reality is, though, that they are probably going too fast. They often break up again and again, and gradually they learn the habit of failed relationships. We may not see this on the outside, because most of the couples seem blissfully in love. It's reasonable to envy that. But in the long run, they will probably envy you, because you have not given away as much as they have. There is a kind of physical intimacy that comes too soon, but there can also be too much emotional intimacy. Take your time.
Everyone longs for love, and you are no different. That desire is on all of our hearts, so realize that you are 100% normal, and there are literally millions of high school students feeling the exact same way you are. I meet high school guys and girls who only want the same thing as you. Not some intense physical relationship, but just someone who will call out of the blue, to talk or hang out, or go to a movie; someone who actually cares how you are doing. As hard as it may seem, do your best to be patient and trust in God's great plan for you.
Hang in there, be at peace, and offer up the suffering or loneliness you feel as a prayer for those who are the loneliest. In the meantime, be assured of my prayers and check out Jeremiah 29:11-14.