Re: Finding my smile...
I think dealing with depression is the first step that needs to be taken here. If you don't feel at all happy, if you are struggling with depression, then I don't see how forcing yourself to be happy when you are not is going to help with anything.
You can pretend to be happy for only so long, after time the cracks begin to show and then your new female companion finds that the person she was interested in (the forced happy one) is actually not that person at all.
I think you really need to give yourself a break over your love life, there are a lot of people out there in the world at all different stages when it comes to love - many people finding it a long, hard road to finding that certain someone, just like you. Don't go rushing into pretending you are a really upbeat guy and finding a girl to sleep with just because you feel bad about the fact that you have no love life - it wont make you feel better or bring you the relationship that you crave, it will only end up in disappointment - is that really the way you want to start out?
Please seek help for depression, I know that Doctors, meds, therapy etc... can sometimes not be as successful as hoped for but any help is better than none and things are not really going to improve by sitting at home and wishing things would change. Try to find things in your life that you enjoy and that make you smile naturally, hobbies, interests, who knows who you might meet thru things like that?
In time your life will begin to sort itself out, one problem at a time, but it involves a lot of patience on your part.
all the best