One cannot understand the difference between necessity and desire by mere words. What you need to do is simply ask for permission from your well wishers like your parents, siblings, friends and teachers for whatever that you need or would like to do. And if they permit, you can proceed. In case they raise any objection then you should understand that what you need is merely a desire and should forget it. It’s always advisable to convince them instead of forcing your views on them. If you win their confidence, it shall help fulfill all your appropriate needs, those around you won’t feel hurt and at the same time you will earn their love and respect.
Besides earning the blessings of your parents, this attitude and virtue of taking adjustments shall be rewarded in due course.