Why were the British unsuccessful in the early years of the French and Indian war? What developments caused the tide to turn?

The French and Indian War started in 1754 when George Washington's
militia fired the first shots at Fort Duquesne. The war began and
victory looked meek for the British for many reasons. The colonies
were disorganized and many jealousies and disputes arose among them.
In addition the colonies' governors quarreled with their assemblies.
The colonies saw themselves, at the time, as trading economic
colonies, not an empire or nation. There was no need or want for a
military and military organization. The British colonies were unfit to
carry out an offensive war. Soon courageous, fearless and…