Your question is all about semantics, and that means it's a little complicated! Change means 'something is becoming something else': "There has been a complete change in the menu." Shift means 'moving direction' or 'moving to a new perspective (either slight or extreme)': "We are going to shift our attention to grammar." Sometimes, shift can be used in place of change, but it's all about 'moving' something: "We need to shift the date of our work party." You could also say, "We need to move or change the date of our party." This is when the two words are similar (mainly when dealing with time). Since it is about semantics (meanings of words), the rules are difficult to learn and sometimes change (or shift)!!

Well, I've never thought about there. But I usually use "change" in I've changed my mind/

Well, I've never thought about there. But I usually use "change" in I've changed my mind/

Well, I've never thought about there. But I usually use "change" in I've changed my mind/