Helppppp😩

Ok so when I masturbate I usually take my undies off watch some porn and rub my clit on my bed, I’ve been doing this for years it’s the only way I can get off idk why but if I finger myself I don’t really feel anything and it’s not fun. But when I rub my clit against my bed it feels like everything. But idk it takes about like 2 minuets and I just can’t take anymore I wanna keep going but it’s a sensation that I can’t keep up with. Any advice ? Has anyone done this before? And if so how can I make myself cum? What does a orgasim feel like idk if I’m having one?