That is a good start! It is possible to lose the desire to be happy. The fact that you haven't is a good place to be. If you stop wanting to be happy, you can still recover.

Do something that shows yourself you actually care about it. Could be your body needs something. Could be your mind. Could be some other way to conceive of it. But your being has needs and you have the power to say "I need this right now" and to give it to yourself. Start there.

It won't fix anything. But if you do it a few times, you'll feel something. And that's all you need to know you're on the journey.