There is a reason the "get ripped before OMM" thread is so long. Frankly, that is my plan. We have 8 months until school starts, people, no excuses!!
OP, if your concern isn't weight related, say if you have an embarrassing scar or deformity, you might consider therapy before school starts. You will see way worse in your medical career and so will your classmates/future colleagues. 99% of people I know view these things with a great deal of empathy and even sympathy, more than many people with disfigurements probably imagine. There is also makeup that can cover tattoos, scars etc.
If your concern is religious or cultural in nature, therapy could help as well especially if it is with a trusted, liberal-minded rolemodel of the same religion or culture.
If you are just uncomfortable and a very modest person, you could try going to a public gym and slowly getting used to the idea of being in that sort of clothing and around people who are dressed the same.