On pourrait dire « Je suis vraiment énervé. ».
In this specific context,
« J’ai hâte ! = I can’t wait! »
is the way to go.
It should be noted that the literal translation
« je suis vraiment tout excité = I’m really excited »,
as you put it, tends to have strong sexual connotations.
I remember answering a similar question a while ago:
How do I say in French 'I can't wait to see them!' ?
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