Jesus was helping us when he said that you can't serve two masters - it wasn't a test or a telling off. Jesus was letting us in on one of life's secrets. If you try and serve two masters, you'll end up loving one and hating the other, or hating one and loving the other - and here's the kicker:- under such circumstances, you won't be able to choose which one is which.
The choice will be made for you, by circumstance, or other peoples agendas.
Instead, choose today who you will serve, or what your main thing is going to be. Then go after it.