A question for the girls... first time tampon worries?!?

What is the best make and why for first time usage?
I tried once and I couldn't do it.
I'm determined to tackle this problem! I'm 17 and want to be able to swim this summer on holiday!
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Update: thanks guys you have given me some great tips! Can i just say to people who said that '17 is way too old' or 'ooh my 11 year old uses tampons...', well I have had my period for less than a year and so I think that it is acceptable to try start using them six months after my first one. I was... show more thanks guys you have given me some great tips!

Can i just say to people who said that '17 is way too old' or 'ooh my 11 year old uses tampons...', well I have had my period for less than a year and so I think that it is acceptable to try start using them six months after my first one. I was still a child when I was 11 so please don't judge before you know anything about me.
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