In "I get excited," GET is an auxiliary verb that basically means BECOME. I'm not sure what we call that tense. "I am excited" is simple present tense I think. They mean: I am excited. = I am describing the way I feel at this moment: excited. I get excited. = I sometimes become excited. This sort of statement often has an additional phrase with a condition. Ex: "I get excited whenever I go to a party." "I get excited every Friday because I can't wait for the weekend."

I get excited (over something). *I get excited when I play tennis. * I am excited (now) *I am excited to see you*

"I get excited" is a statement. And "I am excited" is present tense.

When you put "get" next to an adjective, you're talking about the process of becoming that adjective. For example: "I get nervous when I have an exam". The exam is what is causing you to be nervous, it's a process. However, if you use "be" you're talking about the state of mind, e.g. I am nervous because I have an exam. In that sentence you are already nervous, the feeling is inside you. GET --> the cause, the process BE --> the state, the result Hope it helps! Feel free to ask me if you need more examples :)

The difference is the tense! Future tense: “I (will) get excited” means you will become excited later or are in the process of becoming excited. When you use “get” in sentences like this it can also imply that you are about to state a reason for your feeling. For example: If you are watching a movie that stars your favourite actor, and someone asks you “Why are you blushing?” you might reply “because I get excited when I see that actor.” Remember the tense here is the same as above! Present tense: “I am excited” means you are currently excited/you are excited now. Hope that helps!