Calitobali, you just have to have strong principle within you and don't let anybody lead you astray.
I was 18 going on 19 when I first went to Bali. What made it worse was, I was the girlfriend of the lead guitarist of an American rock band who just whisked me off with him to Bali from Jakarta. The whole group and I went by train to Surabaya first and continued our journey by bus to Banyuwangi which is still in Java. Went across from there by boat to Bali island in Gilimanuk. Straddled along for 8 hours on bumpy and pot holes road. It was crazy, wild and daring but yes; nothing ventured, nothing gained.
However, although I was swept off my feet by this man who I was very much in love with, I stood my grounds knowing that I could never marry him and that there were times, I was perceived like a nerd to the whole entourage. You see, the other members of the band had their girlfriends too along as they were from US; Thai-American from Thailand; an Indonesian model. They were the bass, drummer and and the second guitarist's partners. All were into smoking ganja, taking mushrooms in their omelettes, even hashish, etc. I DID NOT TAKE THEM AT ALL, as I refused knowing very well of my principles. Yet I could easily be dissuaded but NO!. For example, I did take the roll of the cigarette pretending to inhale it but I was like Pres. Clinton. "I DID NOT INHALE".
There were times when everyone would sleep by the beach overnight and go nudes or diving and swimming --- even doing the OOOMMM mantra in a circle. I did not participate and left my bikini on and just stayed by the beach. What a total nerd. I was ...
Then when my boyfriend asked me to elope knowing that my family did not give any permission whatsoever, even though I was on adventurous moods, all wide-eyed; just returning from growing up years in a swinging London; I decided to end our relationship. Besides, I was hungry all the time...
But he still sent for me to come and be with him on his stint in Singapore which I did as a farewell get-together which he was not aware, of course. But that was the last time we were together. I was relieved!
My point is, just do what is best within your core and what is right. Think of your family always. Don't get pressured by peers. Make sure that you come out safe from such seducing atmospheres and surroundings.
And no, there are no beheadings...
Good luck!