First step is tell us from what country you are. Second how big is your average ping to other players?? Max ping to play is 300 ping, good ping to play comfortable game is 90-150. Most games is 3v3, in smaller games people can have little bigger ping. In 4v4 or 5v5 group must have good ping to each other.
How fast internet you have (download and upload speed). Next did anybody use your internet connection in your home in this same time?? You download some torrents or other files when you try playing?? Maybe your firewall or antivirus block something.