Honestly, planning a birthday doesn't do much from what I've experienced. Being depressed can't be fixed with one day full of joyous things. That's not how it works at all, sadly. You have to work on it yourself, everyday, to get better. It seems pointless and impossible but once you're not sad anymore, you'll realise it when you look back and notice how different things are. You'll get there with time and a little effort. But hey, happy birthday.