Why wasn't Thailand Colonized?

As the powers of Europe began to grow and expand throughout the world’s history, colonialism became the forefront of this expansion. Over time, almost every non-European nation became a colony of one European nation or another at some point.Only a few countries managed to escape becoming overpowered by the Europeans, which makes us wonder, how did they do it?For a nation like Thailand, which was surrounded by British, French,Dutch territories, there seemed to be no hope of avoiding colonialism