Tampons??

I’m 15 and have never used a tampon. Its been almost a year since i started my period and I’m a virgin. Im very tired of using pads because they’re getting so annoying (especially at school). But Im scared it’ll hurt and i wont be-able to use one. Im very petite and have a very tiny body. So here are a few questions I have:

1. Do they hurt??

2. What size should i get for my first time?

3. What is the best, most comfortable brand ?

4. Can I use them at night?

5. What is the most comfortable position(s) to put one in?