I'm not sure what most emotions feel like

Since this arose since a traumatic even, you probably have some defense systems in place against feeling these emotions, because you don't want them shattered again. I think many have this issue, though you seem to have a rather strong case of it. You shouldn't beat yourself up for not being 'normal,' whatever that means, but it is good to recognize that there is an issue here. Depending on your persuasion, you might try either psychological counseling or Bhakti Yoga to open up your emotional centers.

Have you talked to a doctor? There could be a chemical imbalance in your brain, which could affect your ability to feel/your secs drive/etc. it isn't your fault. It's no different than someone who has a vitamin-d deficiency, or who is allergic to peanuts and is very common in today's society, They might recommend certain medications, vitamins, exercises, etc. to help you.

If you were content this way, I would say that it is just how you are, but since you said you don't want to be this way, it makes me think you feel something is wrong and want it fixed. Trust me, doctors see this stuff all the time and even if they don't have the tools to help you, they can refer you to someone who can, (you can go down the naturopath route if you don't like pharmaceuticals). Best of luck to you! <3

Simple. You're Dexter Morgan.

Robots don't know emotions and when they do we are fucked.

Nothing is wrong with you, you're just you. Try to get to know and like yourself instead of trying to be "normal." Many people have these kinds of issues, but everyone is different. Accept them. You still have a lot to offer people.