Self Confidence and Sex

Hi ladies,
The boyf and I are having a little disagreement at the moment. We've been together for almost 4 years and I'd say that this argument comes up every few months...
When we got together, I was a slender 160lbs, but since getting comfortable in our relationship, I have crept up to 200lbs. I'm not happy with my weight and obviously I am so nervous when we're about to have sex.
So 9 times out of 10, I have a few drinks, just so I don't care as much about how I look as much and so I let it go. 
He has said that it has made him lose his confidence, as I "have to be drunk in order to sleep with him" but it's not that at all. I am so worried about how I look and I don't have much experience in the sex area anyway that it's literally to calm my nerves. I still fancy the pants off of him, it is just this area. 
My question to you is, have you experienced this? How can I express to him that it is my issue without him taking it so personally?

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