I feel like something is wrong with me

I feel like something is wrong with me. Ever since this year starts I feel like I'm slowly getting worse day by day. I'm too tired to go to school or even hang out with my friends. I no longer have a desire to do my hobbies. My routine is nowhere to be found. And day by day I feel like I'm just there with no purpose. I don't usually question myself. I used to be confident that everything can be learned. But I no longer have the desire to comprehend anything. All I can feel is pain. Most of my time goes to crying and self-loathing. I want to be better again. I want to be happy again. I don't even know how to do that.