How the fuck do men use their hands to make come to a climax

I can jack off anytime and get to a climax within a couple of minutes. I've tried with my girlfriends hands and she's just not able to make me come like I can with a quick wank.<br><br>She tries so many combinations of speeds, grips and she just can't seem to get it right! I'm flattered that you'd make that effort but I just can't seem to cum when a girl is holding my junk. I find it so hard to cum.<br><br>I think I'm just too good at masturbation. I'm not sure what to say to her when she's going down on me and I just can't seem to cum. I feel like I'm killing her vibe if I stop her and finish myself off. <br><br>What do I say to her? Is this normal?