Orgasming

Idk if that's how you spell it sorry 😬 but what does it feel like? I don't know if I've done it, when I have sex with my boyfriend or he fingers me I get this feeling of like pressure in my stomach buts it's a good pressure, is that hitting the g spot? I have no clue about them because I've never had one I think. I don't know what to expect or what it feels like please help me 😔