Finally got a tampon in!!

So I have a swimming party coming up in a few days and I just started my period so I knew that I would have my period at this party, but I only used pads before, I had tried tampons but I could never get them in. Well now I was able to (with a help of a mirror) and I'm super happy that I'll be able to wear tampons now, after I figure out how to do it without a mirror.
P.S. I have a question too, so while I was putting it in I felt a weird pleasure like I was having sex or something, is this normal cause I'm like a 14 year old virgin sooo...