history: I went to a party and it was real bad.  I never took a drink before and my friends were all over me to take a drink Why did you feel guilty for taking a drink?
current: It was not my thing and the moment I took I did wrong. Later in the night I started feeling bad.
next: I can understand. I am not a big drinker myself, but I wouldn't feel guilty about it.  Not unless you promised someone you wouldn't drink.