Actual advice… try again at a time when you aren’t in a hurry, maybe after a shower. Use the tampons that have a rounded plastic applicator, and don’t use the collapsible pocket kind for your first try. Have your legs at a comfortable angle, keep the pelvic muscles down there loose, and gently try several different approaches. When at the real opening, there may be some resistance, but not painful - the mild resistance should give way all of a sudden. If it legit hurts, it may not be the way.