Fingering

Martha
Ok so I really enjoy it when my boyfriend fingers me. While he is doing it, I feel as though I am very close to orgasming but I'm really not sure because I've never actually orgasmed while being fingered. When he fingers me it feels very good but is so intense, I have to stop him after a little while because it starts to feel uncomfortable. I try to just let myself go but that hasn't really seemed to work. Has anyone else experienced this? What should I do?