Being French is easy. You just eat croissants for breakfast, accompanied by coffee in a wide cup, consume lots of wine, gesticulate frequently, philosophise a lot, and shrug your shoulders every now and then while saying “pfff!” (make your lips vibrate while you do it) with a great show of ambivalence or perhaps a hint of disdain. The really good French actors shrug and “pfff” really well.
On to the more grammatical sense of “being”. Here are the main subject pronouns in French and the present tense of the verb être (to be)
je suis (I am)
tu es (you are, you being singular and informal/familiar)
il est, elle est (he is, she is)
nous sommes (we are)
vous êtes (you are, you being plural, or singular, formal use)
ils sont, elles sont (they are, the former being masculine, the latter feminine, if it was a combination of men and woman you would use ils)
The social etiquette of when to use tu or vous is a little complicated, as it is with some of their equivalents in the other languages, but generally you would use vous with strangers or on formal occasions, and tu with people whom you are already friendly and familiar with.