Hi, SF and welcome to JWD. You have possibly taken, with the sole exception of a marriage vow, the most important step in your young life. It takes courage, resolution and a strong sense of awareness to make a decision such as leaving one's religion on grounds of personal conviction. There will be no going back, for what has been done will engender permanent emotional and psychological tremors in the deepest part of your psyche, which will last for as long as memory itself does. But it is for the good, for now, having discovered an awful truth about religions that promise so much but give nothing, you can benefit from an enhanced sense of maturity, that will characterize the rest of your life.
Go forward into the new dawn, for there is one waiting to unfurl, and rejoice in the unfettered freedom that life affords. You have begun to live anew, ennobled by your experiences, and your contributions to the world's stage awaits you. As does JWD. You have new friends here, raucous perhaps, but, who like you also have come to experience liberty in free expression. Here thinking is allowed, so think aloud. Not just your voice but your mind is welcome.
Be not harsh on your sister. Many cannot see the restrictive bonds that the WTS puts in place. In order for repression to succeed it must have a phalanx of deceptive order, as if marching tirelessly in step, for good or ill, is a portend of religious fellowship. Those such as she have been encouraged by the monstrous leadership of this system, to have this almost superstitious conviction that a malevolent fate, invested with divine wrath, awaits one who defects.
Rather await the day that her own eyes may be opened.
Cheers