Feeling lonely, unmotivated, and like I'm not myself. Why and how to fix?

These past weeks, maybe months at this point, I've been feeling extremely alone and I feel like its just me in life even though I do have family and friends around me but I just have this feeling of emptiness and loneliness inside me. I also keep pushing myself away from people and am limiting any outside interactions. I just don't understand what I'm doing and how to make myself feel better. I loved playing video games, going outside, 3d modeling, and riding my bike but everything just feels so worthless, I don't get any enjoyment from things anymore. I don't feel motivated to do anything and have to push myself to work on a project or school work. I can't keep living like this and its breaking me really bad. Everyday I go through this same dumb cycle where I don't even feel like I should wake up anymore and then the rest of the day I just weep in my own sadness putting my head down trying to feel better. I go outside and only temporarily find some peace in mind but I just wanna stop feeling this. I'm losing my mind, I can't think straight pls someone explain what I can do to stop feeling like this I just cant keep going through these things