Your situation is very similar to mine.I only had one crush in my whole life and that was like 3 years ago.I find it really hard to get attached to other people.The difference is that I don't feel the need to be loved by a certain other.Yes,sometimes it sucks to be surrounded by couples , but it's not enough for me to run to the first person willing to have a relationship with me.
Although,I believe this is considered normal.It's not only your case or my case,I'm sure there are plenty of people in this situation.Just because this isn't the majority doesn't mean there is something wrong with you.Just go with the flow and don't force things.Love will eventually come to you just like
>>2 said.