<human>: I'm a 21 year old male and I can't figure out how to feel passion or even excitement with someone. 

I had a pretty rough breakup with a girl during my senior year of high school.  She kept saying I "had her back" only to pull the rug out from under me time and time again.  We had been dating for 1.5 years at that point and I loved her (as much as an 18 year old could, anyways), so the whole experience was fairly traumatic.  I'm definitely over it though, or at least consciously I am.

Since then I've had some serious issues with feeling and receiving romantic love and feelings.  Romantic actions and situations make me extremely uncomfortable, so I act out immaturely to get out of them.

No matter how much any girl is nice to me or treats me lovingly, I am almost never able to really feel her love. I know she loves me in my head, but my heart can't feel it. And to top it all off, I use sex as an emotional crutch and a distraction from the fact that I can't really form normal relationships with a significant other anymore. I am generally a very confident and well-adjusted person, so I don't really know what to do here.

My lack of feelings have messed up every relationship since that breakup.  It's not that I can't *show* my feelings, it's that I don't *have* those feelings.  How can I get my subconscious to stop locking that part of me away? I am totally over that breakup, so why am I still numb?

Could you distill the essence of the text into 1-3 sentences?
<bot>: Had a bad breakup years ago, haven't been able to feel/show romantic love since.  I am totally over the breakup, but still feel numb. What do I do?