Here's that question

I'd tell you to hang in there for a bit longer, eventually you're going to want something different, it helps if you meet someone who exceeds your expectations., cuz that will precipitate things...
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One day you'll be sitting around asking yourself .. is this all there is ? At that point you'll realize that while it's feels good to have someone around to play with, it feels even better when you feel connected to them...
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If you have a very hard time attaching yourself to someone special and you're nearing your 30's then perhaps find someone to talk to (counselling) to figure out why you can't seem to attach. At times it could just be the pool of people you have to choose from.......

Sex as a sport is pretty intoxicating for a while. But I hear ya the numbness comes from having to block out your emotions. Humans aren't robots. Eventually it gets to us all. ..
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Get some counseling. You may not know it but you have issues to work through...

I agree that therapy will probably help you address your concerns. Ain't no shame in the therapy game! Because while you're in this numb state, you may be passing up opportunities that could work well for you...

I'm the yin to Carlos' yang .....
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Well I'll tell you, if you feel like you've never loved anyone, then put the doubt out of your mind ... you probably haven't...
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You reap what you sow, so your likely harvesting the wrong crop...If you want more than just sex from someone you have to be willing to give more than just sex...
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It's not always easy but always worth it to love, a big percentage of one's overall happiness comes from being with the right person...The hard part is finding the right person...
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You likely have been at your "sport" for quite some time & have overlooked some "teammates" because they didn't qualify for the game you were wanting to play... So keep and open mind and eye for someone who is different, someone who sparks a different reaction in you...But i'd say work on yourself a bit, reevaluate some of your past relationships to gain insight into the person you are to help you form the person you want to be...Being the best you is the best way to find love...

You said in a comment: "How do I stop blocking my feelings, but what if they are so intense I can't handle them - what then?.." ..
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If your feelings are TOO intense, that might be a panic attack. That's something you can't just turn off, no matter how hard you try. This is another good reason to seek counseling. If you do suffer from anxiety or panic attacks, there is medication that can help.Either way, a counselor can help you work through this...