hmm, most tampons comes with directions, my mom showed me how (with her clothes on) but i know for a while i couldnt do it because it was too big, so i use OB reg without the plastic thingie/cardboard i know what it is called, but i really cannot think of the name right now lol
i didnt start wearing tampons till i was about 19 or so, before it was always pads, then i wore em 50 50 but now i dont wear pads... i havent since i was 21 or so. i feel werid with pads now like theres something there (because im so used to tampons) but my BC helping me having lighter periods i only wear them when its needed.. most of the time i dont leak. if the tampon is too big, you will know it would feel uncomforable, and u would feel its there. and it has happened that sometimes it might be put in "wrong" but i had maybe once or twice that happened
i recommend pearls or OB i wouldnt recommend tampax i never tried pearls but it looksl ike its more comforable tampax is rough like but i havent used those kinds for years, they changed the OB's desgin and the more comfort fit as it says it actually does feel much better.
after a lil while you will get used to the feeling of a tampon because its different and its new is prob why you feel it.