I feel like I am wasting my life and I don't know how to fix it

I’m a 19-year-old guy, and all my days are blending together and it’s suffocating me as there is nothing new I do. I spend hours on my phone/PC on end and I sleep and eat...that is my day every single day. Without it, I don’t know what to do with myself. My parents wanted me to fill out job applications and I have but heard nothing back from any of them. I also feel terrified to drive anywhere as my mindset I will always cause something bad to happen whenever I am on the roads, and I just don't know anymore. I am an introvert, so I don't quite like socializing much with people which is probably why my LDR ex-gf cheated on me as I feel like such a pointless person that is unlovable. I don’t know how to break this cycle, and I don’t want my life to pass me by, even though it already kind of is. I know it’s silly to be thinking this as a teenager but if I don't break this now, I’m scared this will spread and I will end up completing nothing in my life. How do I find the joy in living and how can I make every day different. Please help