Planında olmak istiyorum.
- I want to be in your plan.
İlerde ne olmak istiyorsun?
- What do you want to be in the future?
See here what it says in Wiktionary. So, you were in the wrong about the meaning of that word.
... comes up to me, and he yanks on my pants and he says, "Professor, you're wrong. There's ...
... that looked at the study you describe and say it's completely wrong. I saw a study that ...