Dude, (assuming this is a serious thread), one thing I've generally found is if you have to ask 'Is something wrong with me?' the answer is generally yes.
If you want to develop the ability to connect, seek some counselling. It sounds to me that your upbringing has left you believing it's safer not to let anyone near you. Caring leads to being hurt and you're protecting yourself.
You said in another thread you want kids. Please seek counselling before procreating. As humans we find it very difficult to not become our parents and it takes conscious effort to make sure you don't make the same mistakes.
'People are never perfect but love can be. People waste time looking for the perfect lover rather than creating the perfect love' - Princess Leigh-Cheri from Still Life With Woodpecker.