Be used to is used to show previous experience and familiarity with a certain situation. For example:
- I am used to living abroad. - I have previous experience living abroad, so it's not difficult for me.
- Jane isn't used to living abroad. - She doesn't have much experience living abroad, or if she does it is still difficult for her.
- Paul is used to learning languages. - Paul has learnt languages before, so he's good at it.
- Carol has never studied a foreign language, so she's not used to it. - Carol doesn't have previous experience learning a foreign language.

Get used to is used for the process of acquiring experience and ability. In the beginning we are less experienced, then we get used to something - we go through a process of gaining experience. For example:
- I wasn't used to living abroad, but I got used to it. - I didn't have expeirence living abroad, but I grew in experience until I was happy living abroad.
- I didn't like banans, but I got used to them. - In the beginning I didn't like bananas, but after a while I learnt to like them.

In the structure be / get used to, to is a preposition, not part of the to-infinitive. For example:
- I'm used to cooking for myself. OK
- I'm used to cook for myself. Incorrect - "to cook" is a to-infinitive and can't be used here.

Used to is a completely different structure from be / get used to. Used to is for past habit, be used to means to get accustomed to something.

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