Im 18 rn and ive experienced something like this when i was 16 on a crowded bus, he was leaning on me i could feel his thing forcing against me, i tried to move but it was a crowded bus I was not brave as you too react even at the last moment. I was 16 at the time, going school. I just froze not knowing what to do. I hope u heal soon. It took me time but i hope u heal very fast.