Well that's great, you didn't lie to your DPs, even telling them where you were once you were an adult, but most kids do and it's not unusual. Why? Because they are pushing against the boundaries their parents have put in place, because they know from telling their DPs stuff in the past what their DPs approve and disapprove of, because sometimes they want to do stuff that they know their DPs wouldn't allow them to do. So instead of saying 'I'm going round to my GF's house for the afternoon to have sex, because her DPs are going Christmas shopping and we'll the place to ourselves', they say 'I'm going round to Max's house', or 'We're taking the train', when the truth is 'We're hitch-hiking, because we want to spend the money we have on booze, not train tickets'. Even 'nice' kids from good homes with caring, attentive parents do this.