In English, we often say, "I have to go to the bathroom." I would think that in French one would say, "je dois aller aux toilettes", but when in France I often heard "j'ai envie d'aller aux toilettes". Wouldn't that mean "I feel like going to the bathroom"? It doesn't quite seem to be the same as needing to use the bathroom. So, what is the appropriate way to convey "I have to go to the bathroom" or "I need to go the bathroom" in French? Thank you so much!