I am not used to get up early.
I am not used to getting up early.
If you are used to something or someone, they are familiar to you and no longer seem strange or difficult.
After be used to, we use a noun, a pronoun or a verb ending in -ing. The word to is a preposition here.
Do not confuse be used to doing something with used to do something. The second structure describes a past situation or habit that is no longer true.
See USED TO