No matter what your age is, a mother never stops worrying. I think "Mom" is afraid you will be hurt. She may not say it, but it's probably in the back of her mind.
As far as your friends go...well, my daughter actually had a similar situation except, they DID go through rush-were heavily cut-joined a strong church org-and now criticize the Greeks.
She still keeps some contact with them, but it's pretty hard when every time she's with them they act as if she needs to be saved or else she's "going to hell."
Your decision- "To thine own self be true." If this is what you believe you want, you would be filled with regret and "what ifs" if you DIDN'T give it a shot. You seem to know the obstacles and accept them. If everything was handed to people on a silver platter, where would we learn victory or appreciation for taking a chance? No matter WHAT happens you will gain much more than you risk. What IS the risk? Exposing your self to others? If people could get "pride" out of the way they would take more risks and in the end, they would have more successes in their lives. My heartfelt wishes for YOUR success and deep admiration for your decision!