Is there a way to stretch yourself out?

I have a super tiny vaginal hole... I’ve had my period for 5 or 6 years now and I still can’t get a tampon in. I’ve tried various ways and sizes and I just can’t seem to do it. A lot of things I’ve read say that I need to just relax bc I am probably tense but I can’t seem to do that. My boyfriend has tried fingering me and also found it very hard to get in.. if anyone has any recommendations of what I can do that would be wonderful bc I really need to use tampons lol