Tampon Problems! Please Help?

During my last period (two months ago) I tried tampons for the first time. I put it in, and didnt feel anything. When I tried this month, the same way, I could feel it in. It felt like it wasnt in all the way and at times it would feel like it was falling out. Yesterday, I forced myself to wear one. It was ok when I sat, but when I stood I kept leaning forward cause it hurt so bad. I used the same brand, and tried inserting it diff. ways. I even tried "super" instead of "regular". Nothing works, and I need to use tampons! Please help! :(