tellement excité(e)
You say: 'j'étais content parce que c'étaient les plus grosses montagnes russes sur lesquelles j'ai été', but I replaced exited by happy cause exited has a sexual connotation in French. And yes, we say 'Russian mountains' for roller coaster!
To say "I am so jealous!" in French, you could say Je suis assez jaloux!
There is no "won't" in french, so you say the opposite of I will. Je ne vais pas.
Egality in french is "égalité" Not so different :)
"Believe" in French is "croire."
It is a French noun, so it is the same, "turquoise".
"So is life" can be translated to "C'est la vie" in French.
In French, Greg is spelled and pronounced the same way as in English. So, you would simply say "Greg" in French.
"So far" in French is translated as "jusqu'à présent" or "jusqu'ici".
It's not a French name so it stays the same.
There is no such English word as "gitare" so we can not translate it into French for you.
To say "I am so tired" in French, you would say "Je suis tellement fatigué(e)."