Struggling

Recently I've just been feeling like everything is too much. I'm exhausted both physically and mentally and feel like I'm going through each day with no purpose, waiting for something to change. I'm getting caught up in things from the past that don't matter and don't know where I'm going with my life. I'm mentally battling about going back to someone I was once close with, and even though I know I'm better off without him in my life it feels like it would be easier if I wasn't so alone. I feel worthless and every day I'm wondering why I'm even bothering. I honestly don't know what to do and I don't feel like I can talk to anyone about it.