I THINK I NEED HELP.

I've only worn a tampon 5 times but I honestly have no idea where my Vagina is. I don't know where I bleed from. I fear that I keep plugging it up the wrong hole. Should a tampon hurt when walking around all day?? I feel like it falls out. People keep telling me I should feel anything but I do and pulling it out hurts like hell. I need to learn how to apply a tampon by this summer because I will have swim classes soon. When swimming does it normally rub?? How can some plug 2 tampons up there without knowing?? If tampons are this painful is this what sex feels like? So many questions! How to you plug a tampon in?? I need help I can't locate my Vagina.