Number 5 is the answer because it summarizes the topic of the paragraph.
Not feeling like you belong can negatively affect your ability to develop by not wanting to put in effort to do your best and get better. It can also positively affect you by making you want to work harder and try to fit in, and if you can’t fit in at least you can do the best you can. Not being able to fit in can strongly motivate or unmotivated a person to develop and get better at things.
