can’t use tampons!!!

I’ve been trying to use tampons since I was 14, I’m 17 now. I thought maybe it would be easier after losing my virginity because I would be more used to things being inserted in my vagina, but I still feel resistance and mentally psych myself out to the point where I feel queasy. I’ve tried lube and everything. has anyone else had this experience before, and did you figure it out eventually?