Is it normal to have difficulty putting words together?
For most of my life I have had difficulty thinking of simple words and phrases, and by the time I thought of something, it would no longer be relevant to the conversation. And when I try to just say it as the words come to mind, my speech is filled with "ums" and I usually end up trailing off because the person I'm talking to seems like they're getting impatient with my constant "um"ing.
Other people around me seem to have a much easier time thinking of how to explain their thoughts and ideas in a much shorter time that I need to.