Learn to build boundaries and befriend your roommates. If you are in good relations with your roomies they won't exploit you as much and you'll be able to negotiate the terms of cohabitation better that way.
If you are on friendly terms, you won't be bullied, this doesn't always work, depends on your luck, there are times where new guys start picking on others instantly and have a group of their own too quickly.
Assertiveness is key, I know a friend who's an introvert and didn't manage to earn respect of their mate and they suffered 2 years of having to deal with all kinds of fancy behaviour, loud music, inviting a girlfriend over all the time, being annoying and interrupting what they were doing, etc. Their verbal opposition amounted to nothing and they were treated to shrugs most of the time. Until they finally changed the dorms.
If you can't be friends, earning respect some other way is an option, if you can safely intimidate them or make them view you as an equal any other way, you can consider doing that.
I'm not sure how tough your environment is going to be, I didn't find overly aggressive males above the age of 18 that were unable to reason so it may not be that bad.
One time I had to beat down two bullies from my room at a summer camp to earn peace for the duration (I wasn't particularly fit to take on 2 guys, so I made a surprise), so I know how crazy certain situations can escalate, especially among the young and stupid.
I'd say violence and similar offences are generally ill advised, unless you are in a self defence situation with at least one witness (neutral or friendly person, obviously bullies don't count). Bullies can sue you and destroy your life in more than one way.
Though at this point it would be too pessimistic to assume anything extreme is going to happen.
You can most likely judge the would-be personalities of your roommates based on your high school experience with people.