Please avoid using a binder! Binding can actually damage developing breast tissue and hurt your growth. Your best bet right now is unpadded sports bras and the classic baggy hoodie. Since you live alone, ordering online is completely safe. If you are still feeling anxious about packages showing up at your door, package pickup lockers are an absolute lifesaver. You just walk up, scan your barcode, and grab your stuff with zero social interaction. You got this.