In all my life, I don't think I've ever had even one real friend.
Wow, that's too bad. How does that make you feel?
I feel very lonely.
I'm sorry you've never had a real friend, and I can understand how you'd feel lonely because of it. I think you should get out there and try to meet some friends, because it will probably make you feel happier.
I try making friends and they always end up leaving me.
Perhaps you could think about why you never end up with long-term friendships. Maybe if they're based on something shared, like a hobby or religion, you'll have a better chance of keeping some friends long-term. You could consider joining a club or religious institution to find like-minded people to befriend.