ok tell me how does it help owning europe and africa north america can attack europe and brazil can attack africa and Asia can attack bot continents how is that ment to be a good strategy when lets say there was 3 players one owns north and south America and one owns australia and asia then there is the guy in the middle the one who owns africa and europe the other two players would just push europe and africa till its gone how are u supposed to beat the other team when they are thashing u.
The Earth is round! You may feel that Europe is in the middle, but based on your division (third for each) everyone is able to attack everyone else.
You have spotted the main problem quite well. The problem is that if you only think on where you want to place your armies, so that you can win the game, then you have only done half the job. Risk is not like Chess, and so there is no perfect openning or perfect moves.
What you need to do is to practice on the political side. I suppose you have already played with your friends. This is a great situation to be in. Because you know who you are playing against. This time try to adjust your game based on what they did last time. For example, try to drum up support to attack the guy who won last time, may be he is a strong player. Take him out of the game, and you may have a better chance to win. Of course you need to get other people's help, dont try to do all the fighting yourself. If you see yourself in the middle of others, then get others to fight each other. In short, try to use diplomacy ......