How can I build a healthy routine

Hi I'm li, I am F19 and have been living by myself for almost a year now.. My mental health have been an absolute mess the past few weeks I feel so chaotic and imbalanced... Like nothing feels organized I'm currently working 2 jobs and I try to hang out with friends as much as I can but then I end up only getting 5 hours of sleep and I used to be good at going to the gym and now I barley go once a week and I just feel like my life is a disaster and I would really appreciate anyone's advice on how I can start to bulidna routine that might help me feel less chaotic and more organized.