DRUGS RUINED MY LIFE?

I had the best gf any one could ever ask for she was beautifull treated me amaizing never did anything wrong to hurt me. she was amaizing i love her more than words can explain. But the thing is iv been smokin pop n drinking and other **** for the past 5 years n she wanted me to quit just like cold turkey n i tried but it just doesnt work that way i told her i havent quit cause i couldnt keep lying to her about it. n of course she broke up with me. but its like i wana quit i wana be with her forever its just way to hard to change who u are over might. im gona quit i dnt wana do this **** my whole life but i need to do it by myself i cnt have people forcing me what to do but i love her so so much everything i do i cnt stop thinking about her. i just need help with what to do and what other people think about my situation. so please help. P.S. you dnt need to tell ima piece of **** cause i know this im a horrible person for what iv put her through n i know what i lost so please dnt make this any harded fer me than it is. thanks