Mate it could be any number of a million reasons. If you're too rough when you jerk off then you'll be desensitized. If you're strssed, on medication, take drugs or smoke or drink a lot, or have a bad diet, don't exercise, etc, then you'll have problems with blood flow and sensitivity. If your mind is occupied then you won't be able to relax. If you're really not into your partner, physically or emotionally, it can be difficult to finish. And finally perhaps your partner just aren't so good at sex yet?
The point is that there is no clear 'blame' here. Can you narrow it down to anything that you might think is causing this? Unhealthy lifestyle, stress, new partner, anything like that?
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