Guys, is it a turn off if a girl has little or no friends at all?

[Q]

You are an introvert and that is not at all a bad thing. You are content being alone. The people in the groups in the corridors are extroverts. For them being popular with people is super important.
Luckily there are more than one ways to be popular. Doesnt have to always be gossiping or showing off in groups.
Bottom line is people do not like you for who you are. But for what value you bring to their life.
Thats what being popular is. People flock to popular people as they feel just being seen with a popular person improves their social status as well. Higher social status means higher survivability.
You need to find what your passion in life is and start adding value to peoples lives using that. Just an example: say you like photography, then offer to be the photographer at some party. That way you can do what you like and also be popular.