I totally know what you mean. I'm going to uni in around 2 weeks and I'm psyched but worried that my old self complete with vices and annoying habits will follow me there. Can people really change? Hmmm well I tried to (not radically change) but trying to be a lot less shy and more talkative and confident and I definitely changed during college but sometimes with new people I just cba to talk and make convo or too shy and always say "I'll be better next time" (I never am), but I'm just gonna take it as it comes, being in a new environ will hopefully force me to change.