Really, I'm curious as to why at your age you've not yet kissed someone, much less been in a relationship. I've heard people on this forum (that were older and hadn't been in a relationship) say they spent a lot of time in post secondary and studied hard and then went straight into a demanding career that didn't afford them time for a relationship. That's still sad but it makes sense. What's your deal?
I'm not here to make you feel better, what I will do though is ask you to take responsibility for the actions you take in your own life. Depression and lack of self-esteem are both things that can be fixed by choice or by therapy. I ask you, what are YOU going to do to make changes to be who you want to be and do the things you want to in your life (like have a relationship)? No one else can do it for you. Some internet responses aren't going to fix your self esteem.
Live as if you were to die tomorrow. Learn as if you were to live forever. - Mohandas Gandhi