You are worthy of love Gareth. We all are and you seem like a good guy. It's very hard to find apartner when you are so depressed - you need to get on top of that first and foremost. If your anti-depressants aren't doing much, try changing brands or doseage; it can take few tries to get the balance right.
Find worth and joy in life outside of romantic love. Think about all the things you are good at. You might not have a partner but maybe you're great at your job or perhaps you're a kick-ass boxer. I don't know but there will be something.
Your friends and your family value you too,with or without a partner. You don't need someone to be whole or happy, but when you see that, you'll be in a better position to find someone.