Help needed

Whenever I’m fingering myself or my boyfriend is eating me out, I have this feeling where I feel this strong sensation where I feel like I can’t continue so I stop and stop him as well, he sometimes tries to continue and my legs just shut together and then after I just have my legs crossed because it feels Goodall I put pressure on the n my clit. He ask why I do that but I don’t even know it just somewhat helps. Is it that I don’t let myself orgasm?