My life feels like its going down the drain

Im 19 year old male who is really overweight, has no job, and addicted to porn & vaping.

about a month and a half ago my girlfriend of 1 year broke up with me. The whole relationship it was my fault. the way i treated her. all the effort i didn’t put in, the flowers i didn’t buy and the dates i didn’t book or plan. she gave me unconditional love while I didn’t give anything, and now I have to live with the realization that I treated someone that loves me so much like that.

I have been going to a poly tech for a year doing an electrical pre trade level 3 and I was coming up-to the final test when we had broken up. From that point everything felt hopeless and no point without her. i ended up for the week before all the way up until just staying up really late then just sleeping in my car and going home. every day including the test day. I had one week left and i threw away a whole year because it felt to me that it didn’t matter.

Im currently in the process of getting diagnosed for adhd which everyone is very confident I have.

Also I live a disorganized life with my parents. They always ask me to do things that i never end up doing and i live in a disgusting mess of a room

I really just need some thoughts on this because my life feels like its already met its conclusion of what its going to be from now on. Im not suicidal but i just feel an emptiness and I cant even cry when really need to.

if there are further questions i can answer them in the comments