I am 29 years old never been pregnant that I know of and I have never seen an ob/gyn before and kind of scared too cause I am afraid I can't get pregnant I have tried before but never happen can you tell me why? And both my sisters have kids

There is absolutely no way to give a diagnosis online.

If you've been actively trying for 2 years, tracking ovulation using basal temperature, with no success, then it's time to see an OBGYN. You won't find answers online.

Good luck.