The misconception that most westerners have about Thai food is that it has to be spicy to be authentic. Nothing could be further from the truth.
First, until the Europeans came to Thailand and introduced peppers, Thais never ate spicy hot foods. Their recipes were more similar to the Chinese or Vietnamese.
Second, there are a lot of Thai people that don't like spicy foods either. Hot chili peppers are as unconfortable to the Thai palate as to the western tongue.
That is why I always suggest that you only add as many chili peppers to a Thai dish as you can stand. And if you don't like spicy...feel free to cut out the chili peppers altogether.
Now that being said, there are many recipes that call for certain curry pastes and prepared ingredients that are difficult to prepare from scratch. These often come with chilis blended into the recipes .....so there's not much one can do about that except to use less curry paste.
But safe to say that if you don't like "spicy", just omit peppers from the recipe and you will enjoy Thai food a lot more.