Do you ever struggle for words?

Yes, yes of course. I find myself struggling with words whenever I am in a social scene, or any kind of scene that includes others. I’m never sure where to start, how to go about whatever I’m on about, and the worst part is ending it. Sometimes I can speak with ease, but most of the time I find myself stumbling over my own words. This is actually something that frustrates me continuously in my everyday “life”.