My daughter is queer, and she is also an only child. So she basically made sure that it she would share a room with somebody who was LGBTQ-friendly, and stated this on the dorm forms. She ended up with an amazing roommate and they are best friends. They weighed sharing a room this year, but Sophomores are usually in singles, so they opted to take adjoining rooms.
Your generation tend to be a lot more accepting and comfortable with sexualities which are different than their own, but add to your preferences that you prefer somebody who is LGBTQ-friendly, so you don’t get stuck with somebody who is homophobic. If your dorm forms don’t have that option, call the residence people, and ask them how to ensure that you don’t get stuck with somebody like that.
Good luck, and go have fun!!