Masturbating question

Ok. So I like to masturbate in the shower with strong pressure on my clit and vagina (but mostly clit) and it feels like its on a pressure point and I love the uncontrollable pleasure but it gets quite strong and i feel like my whole body is shaking and a strong vibrant feeling is sent through my legs. When it gets really strong I feel like I'm about to pop but I stop before that happens because it's too much pressure. Is this an orgasm or is this something different?