Can't join any servers in any versions or clients of minecraft.

For the past couple of days I haven't been able to join any server. Every time I try to join a server, it responds with 'servers are down for maintenance' which I know isn't true as my friends from my neighbor hood are still playing. They do not have any issue at all joining anything. So I know something is up. I thought maybe it could be my new client but even if I switch nothing changes.  Even on some occasions I almost join and for a split second I can see the terrain rendering, but then the 'servers are down for maintenance' appears. I have tried to join with different clients on different versions but still nothing. It is like I have no internet since some servers have very poor or no connection at all. My skin doesn't even render in single player! I do know I am connected however the launcher says I am connected. me I hope you can help me with this because this is just getting frustrating.