I cant in good conscience advise you to buy/begin using illegal drugs. Indeed we dont know eachother but that doesnt change a thing in my mind; I pride myself upon my compassionate nature in a seemingly uncompassionate modern society and dont want you to do yourself harm.
However I can explain to you from first hand experience what helped me (in moderation and for a temporary time) when I was your age and was sincerely considering suicide due to my TRD (Treatment Resistant Depression) diagnosis. Upon receiving that I knew psychiatric medication - the likes listed within the endless litany of SSRIs, NDRIs, SNRIs, SNDRIs (etc, etc...etc) I felt I'd never achieve success with the ilk, as for 10 years prior I didnt and I was at my wits end with feeling like a guinea pig (gaining weight so fast I developed stretch marks, forgetting peoples faces, names, not being able to string a sentence together, lacking any vestige of my former personality, too lethargic speak, too drained of energy shower, listeless...I'm sure you know exactly what I mean).
Anyway, first thing that brought me out of myself in terms of substance, was Benzodiazepines - namely Diazepam. It enabled me to actually realise that what I thought was a serious depressive disorder was in fact a serious anxiety disorder (I'll be seeking counselling for that in the new year actually).
The other thing was any kind of opiate. I'm not talking shooting up heroin, because that always had the potential to kill me and I didnt want to kill myself, I just wanted to live. I did smoke heroin for a time however, which (candidly enough) was remarkably effective but ultimately that choice will lead you down a path of using just to stave away withdrawals (and if you think your depression is bad now, that'll show you just how far the rabbit hole of depression goes).
15 eh? It was 14 with me. Couldnt legally get prescribed psych meds in Ireland until 18 so had to grin and bare it until then, and until then I wasnt grinning very much as I was (in retrospect) performing a kind of self harm upon myself my neglecting my dental hygine so that my family might listen to my cries for help as regards to my legitimate depression but I just...dont think they could wrap their heads around it at all and so I was left to my own devices for the most part.
You've had success with Seroquel?
Could you tell me about your experience with that please?
The typical 9/10 month wait for psych meds to kick in consumed so much of my life that I just couldnt afford to potentially waste any more of my prime on them.
Cymbalta worked for about a fortnight.
If you have any questions for me I'd be happy to answer.