I'm very overstressed and unmotivated help???

So I went through a lot this year and been very unmotivated... I focused on working on my innerself a lot. Lately I've been upset about my cat because he has a lot of problems and I don't have much money for it, I don't want to give him away(he's about three months) and I love him so. I began to smoke marijuana a year ago and was wondering if it had an affect on why I no longer felt motivated??? I did begin to slow it down by cutting myself to only smoking on weekend and been slowly putting myself for a rountine everyday but I feel stressed because I'm 19 y.o and I do not know what to do with school, I've been out of highschool for a little bit over a year now and felt like I don't know what I really enjoy or have a passion for to make it into a career.. I felt like I'm not heading anywhere in life, lately all the stress has been bringing my relationship down. Even though I know my partner will always be there for me and love me but I feel alone and I know my partner and my cloest friends have their own lifes to worry about. Is there any life advices or tips I should follow to feel less stressed and get back on track?