There are two versions of "too much".
1. We are clingy, because we put our worth into whether other people like us and find us attractive, so we hold too tight, and smother people.
2. A person doesn't actually like you or want you to stand out, outside of them, so they try to stamp out your personality, by telling you, you're "too much".
And when you grow up in an unhealthy environment, it can be really hard to tell these apart, because you've probably been through both.