You sound a lot like I used to be. I still sometimes have trouble identifying my feelings, but I don't have much trouble talking about them any more. Expressing them fully through anything other than words is still difficult.
However, I suspect that if you're having trouble talking about how you feel, it's possibly because you have trouble identifying how you feel. Do you think that's true?
Have you tried journaling? I found it very helpful in figuring out what was going on in my head, intellectually and emotionally. It also helped me to start talking with friends who I wasn't romantically involved in. Even without issues of trust, if your girlfriend has complained then you'll probably feel pressured to share, and that will make sharing harder. There won't be that pressure with a considerate friend.
So my advice is to start off with identifying your feelings for yourself, then work on communicating them, starting with people other than your girlfriend if it's hard with her (but I'd also suggest you tell her what you're doing, and more importantly why, otherwise she may think you're fine with talking to anyone other than her, and that will upset her for sure)
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