i want to say 'i'm not excited' is this correct?

Heyecanli = excited

Heyecanlimiyorum ? ?

Heyecanlı değilim sounds better.

However heyecanlı is an interesting word. In English excited and nervous are both translated heyecanlı, yani (i.e.) heyecanlı is both a positive (Excited) and negative (nervous) emotion

Marion, nervous mostly translated as "gergin" heyecanlı still has positive meaning. I am not excited "heyecanlı değilim"

There is an equivalent word of "Nervous" in turkish, however after language reform ( 1930's) its not used so often.

"Asabi" matches perfectly with Nervous

Old medicine books included : Nerve system = Asabiyet

It matches "Nervous" both in scientific and social language.

"Asabimi bozma" - "dont make me nervous"
and "Asab "= "neuron"

However, today "Asabiyet" is only used for "anger". And "asabi" is only for "Angry" - Which is incomplete.

And nowadays, we use "heyecanli" to explain some situations because "asabi" changed location of meaning in people's mind.

Thanks everyone for your comments, I agree. It is just something that I have noticed when Turks speak English, they sometimes chose the wrong one.

e.g. Bu kadar çok insanın önünde konuşmaktan heyecanlıyım
I am nervous about speaking in front of so many people. (In this case the person is expressing a negative form of nerves e.g. they are shaky and scared)

Haberini aldığımda heyecanlıydım
I was excited to hear your news (In this case a positive form e.g. they were happy and thrilled). NErvous wold sound odd here

In both cases it describes that feeling of your heart beating fast, etc etc

I agree that as Turkish has evolved asabi is more used for being awkward or tiresome. The Americans have a great word that is not in British English: ornery