No, it is not just you. The Dota 2 Game Coordinator servers have been broken since 08:30 PM SGT on Wednesday, with the majority of players being unable to find a match at the moment. The good news is that Valve has stated that it has already identified the issue and is currently working on a fix.
Game Coordinator Issues
Dota 2 players started complaining about various problems with Dota 2 servers earlier in the afternoon. The client often lost connection to the coordinator, which prevented players from finding their next match, as well as causing issues with matches being recorded on Valve’s database.
Earlier today, the lead developer of Dota 2, IceFrog announced that the first part of the new patch (7.27) will be released in about two weeks. He elaborated that it will be aimed at changing item changes, economy and misc general adjustments. The patch with hero focused changes will be released shortly after.