The orgasam paradox

Y'all. This is the most frustrating thing. Ya girls been touching herself from the age of 12, and can orgasam every time. It doesn't take me long when I'm alone, and I always thought that would make it easier for me in bed. Now I'm 20, and my boyfriend can and will go down on me for a straight hour, on top of trying multiple other things (bless his heart) and I still won't come. It's incredibly frustrating for both of us. Do any of you know how to get over this roadblock? Is it all in my head or is my body just not used to other people? Help???¿¿?