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We use “I used to do something” when speaking about the past, in order to express that we did something on a regular basis, and that we don’t do it any more.
For example: When I was young, I used to cycle every day.
We use “I’m used to doing something” to say that we do something on a regular basis in the present.
For example: I’m used to cycling every day. (meaning that I do it on a regular basis, in the present.)
Note 1: In the form “I used to do something”, “used to” is a modal verb; whereas in the form “I’m used to doing something” the cell “used to” is an adjective.