I am used to ... Here "to" is a preposition, so it must be followed by a noun or a gerund. I am used to cold weather. [cold weather = noun phrase] I am used to wearing warm coats. [wearing warm coats = gerund phrase] Here is a related italki discussion: https://www.italki.com/post/question-485415

Hey Mohammed, the first one is correct " I am used to going on a trip every summer"

What meaning are you trying to get across? I used to = in the past but not true now, I am used to + noun/gerund = I am now familiar with. I am used to go on is impossible grammatically...

Hi Mohammed you can use "I am used to going on a trip every summer."

I am used to going on a trip every summer.