will my bust size ever grow in my current circumstance?

Hi,
No, scoliosis should not effect breast development either in the positive or negative.

It is normal for one breast to be slightly larger than the other but, if the difference is pronounced, consult your physician.

With a wt of about 42K you are obviously a petite woman. Large breasts would look abnormal on you. Yes, you could stand to gain a little weight and your breasts would probably grow some(not much). At 20 yrs old One would expect you to weigh more. How tall are you?

Also if you gained some wt.(maybe up to about 60K) clothes would probably fit better and look nicer on you.

If you are depressed, you likely don't feel like eating much and this doesn't help. I think you should discuss these feelings with your Dr. Your Dr. can help you explore how severe these feelings are and if treatment with medication, counselling or just reassurance is needed.

Well dear yes of course when you will start gaining weight. then you will of-course get change in your body parts and they will be good.