My problem is that I cannot last more than a few minutes during penetrative sex...

When being wanked, or BJ'ed I can last for ages, but as soon as I enter somthing just clicks in my mind and I immediatley can't prevent cumming!

Does anyone out there have any advice to help me? I really would love to be able to last indefinetly..
Are there techniques people have practiced to allow them to cum when then want?

Please help!