Thai is a complex and fascinating language and tone is very important for meaning.  While it may be difficult for you, try to learn some Thai.  Don’t worry about getting the tone wrong (you will).  Thais expect this but appreciate the effort.  In fact, showing that you know some Thai in a market can usually get an immediate smile.  Sharing language and culture is very important.  After the first month you may notice that you speak English more slowly and use gestures along with your Thai vocabulary to get your point across.