how do i come across as less intense?

I’m a really enthusiastic person, and most of the time people only spend a few minutes with me before assuming they know everything about me: either I’m dumb and ditzy because I’m really bubbly, I’m basically psychotic, or I don’t care about the feelings of other people. my close friends always say that how excited I am about pretty much anything is one of my best traits, but how do I tone down the negative parts?