its just the same as dust2 and being terrorist, or office and being ct, or even highschool and being t....the ones that need to fulfill an objective is usually the underdog team because as a pub its fairly rare to find a team that will actually work together as a team and do things together and listen to each other rather than everybody trying to rambo and just kill the other team.
these complications show just how much CSS is more than just a shoot-em-up because you cannot do that...you need to work the map etc etc.
So yes most of the people that play CT do not know how to and so CT is the underdog team...just need to do your best to be there and rally them together.
i personally like CT on italy because i love out sniping people, but to be honest 90% of the time i play as a CT we run out of spawn and 80% of the team runs into apartments where Ts can hide in furniture and around corners and then CTs face a very long run down a narrow hallway which is basically a turkey shoot, especially since you need to look both ways (ahead and behind of you) because most likely somebody is on the apartment roof.
Let me give you the best tip for playing CT....APARTMENTS IS THE WORST PLACE TO GO. However don't forgot to cover it, because Ts will come through quite easily...so watch your back!