i think it's hard for me to say. I've never been interested in drugs. I've never been interested in promiscuous sex. I'm interested in all kinds of music, including the punk/hardcore--and i still listen to it today.
i do not think that it is a "fact of life" that people "want to party" by using drugs. I think that some people may find that fun or interesting and enjoyable--i find it boring and uncreative. I think that some people may think that it's open minded to try a few things--i think the argument can be made, but it is also possible for a person to be open minded and discover that they're really not interested and that there are other ways of reaching 'altered states' that last much longer and have an incredibly positive effect on the individual and the world. And, i also think that just because a person doesn't use drugs, it doesn't mean that they don't like to "party" in the sense of going out with friends, hanging out and talking, dancing the night away, and just generally having a good, uninhibited time (the uninhibited part comes from self esteem rather than a drug to calm the nerves).
I guess you could say that i'm 'straight edge' and will be for life--but it was never a hard decision for me. Perhaps because it wasn't a decision that was particularly active, i'm not 'straight edge.'
for me it's simple: i've never had any interest in drugs, so i've never taken them. I've been around people who use them; i've been to numerous parties where just about anything you can imagine was available and i never used it. It's not because i sat down one day and was like "drugs are bad m'kay!" I was just never interested, so i never did it, and it's likely that i never will. It's not a thing of pride for me; it's not a thing of embarassment for me; it's just what/who i am, and i think that's pretty healthy.
and, i avoid using any kinds of kinds of over the counter or prescription drugs too: no asprin/ibprophen, no cough syrup or nyquil type stuff, no antibiotics, no medications. I'll only take them when necessary. I do use various numbing drugs for extensive dentle work. after the work is done, i don't use pain medications. that's just the way i am.
caffine is questionable. i'm not sure if it can be categorized as a 'drug' even though it causes 'alterned states'--as garlic and onions and other spices can cause altered states for some people, sugar can too. i think that perhaps it can be because of it's addictive qualities. i'm not sure. I do drink things with caffine in them--usually tea. it's not a lot of caffine, but there you go.