"why do you do what you do?... what do you do again??"

"Why do you do what you do?... what is it you do again?" these statements came at me in a conversation i was having with a drunk guy the same age as me recently. over and over again he just kept saying "yeah but why" (i never knew who frustrating it was until it was done to me!!) he didnt understand why i didnt drink, why i walked around the street at midnight chatting to young people, he didnt understand why i didnt do crack, he didnt understand why i was bothered.
"why do you do what you do?... what is it you do again?" i absolutely loved the conversation and although he was slightly drunk his statements have stuck with me ever since!! Why do i do what i do? he also kept saying "yeah but your 19 you should be going out getting **(drunk)** and **(having sex)** with some fit guys. your 19 you should be having fun, loving life, free and easy" And i agree with him, well to a certain extent. i am 19 (thats a fact btw!!) and i should be going out and having fun, enjoying life.
So why do i do what i do? Because i believe in a god that created me, not by accident or mistake, he created me intentionally. I believe that god has purpose for my life. I believe that there are people out there that god also created intentionally, for a purpose but for whatever reason dont realise it. I believe that my god is a god emotion. He loves me more than i could ever understand and i believe that my god would want all the other people out there to realise his love for them. I believe the best thing i could do is recognise and worship my god. I believe through my relationship with my god i am saved when i die and i also believe its not my call to keep this to myself.
I do what i do because i dont see that i cant.