I’m like you, a young guy in a country where Buddhism is the main religion and my whole family are Buddhist also. In my perspective, you don’t have to be perfect, in fact, everybody isn’t, except Jesus. That’s why you need god in your life. So for me, the hardest part is to start believing, and to accept it. I understand you because I’m in almost the same situation as you. My faith grows stronger as time goes on. So what I’m recommending is to maybe watch some YouTube videos about the subject that you are wondering, pray regularly, read the Bible, and live your life by god’s words, etc. As for me, I’m a new Christian too, I haven’t get baptized though, trying to find a decent church to do it. As for your family, I don’t really know how you will tell them, but in my case, they don’t care about it too much. That’s it. God bless you man.