There's a big difference between used to live – to talk about past habits or states and is used to doing – to talk about something that you are now familiar with.
For example, a common mistake is "I am used to study."
Do you mean that you used to study, but you don't study any more, or do you mean that you know about studying?
Avoid making mistakes by remembering the verb pattern.
Used to + verb describes a past habit or state.
He used to smoke, but he doesn't now."
To be used to + verb with ing describes something that you are now familiar with.
For example, "Five years ago, I didn't know about the internet. Now I am used to working with it."