Frustration

Okay, I'm a pretty easy going person. Okay, I may be a little crazy, and extremely random, but I'm not an intense person. Which is why comments like this irritate the fuck out of me:
***
My English Teacher: Oh look at Kate, don't you think she looks like a heroin addict?

My friend: So, what's it like to take acid?

My Dad: You're having a nosebleed? You've been taking too much cocaine.
***

Now, I have nothing against taking drugs, I just don't do it. I'm not straight edge, I just don't do that really. The hardest thing I've ever tried is weed. I have never done hard drugs. I have never been addicted to anything worse than caffienne.

So why is it that people see me as some kind of hardcore druggie? I know these were all meant in fun, and no-one really meant anything by it, but it really irritates me. Is it stereotyping? Do I look like a druggie? Do I act like a junkie?

Sorry, I mean no offense to anyone who has done/does drugs, or who has any problems with addiction, but it's ridiculous, right?

Someone please tell me it's normal to be irritated by this.