Exactly that.
I'm early 40s, have had several relationships, but realised i've never been IN love. I've liked them (some not so much) as you would a friend, but I've never felt that connection you would if you were in love. I don't know if it's because I've been treated so badly (physical/emotional and verbal abuse) that it made it impossible to have those kinds of feelings, but I'm now worried that I won't ever get to experience love.
This actually makes me incredibly sad.