Answer please ! Do I have to get baptized again?

My older sister goes to this church, she said you need to get baptized and have belief in god to be saved. She cried a little while after telling me that because she said " she wanted to be saved ". My families a christian, i have never seen my pictures of my older sister getting baptized when i asked her of she i did she said i dont know. I've seen pictures of me getting baptized as a baby. But now I'm hearing things like their going to pull you down a pool filled with holy water and when they pull you up you feel a whole different you ? I believe in god, but do I have to get baptized twice to be save?