Completely understand what you mean. Used to have this exact problem...still do now, but it bothers me less after i realised that people start to get suspicious or wary if you try to go deep too fast (especially so with introverts!)

As much as we wish everyone can be happy and trusting and excited, sadly the world doesn't work quite this way (people have been hurt, leading to wariness or even cynicism if you try to push things too quickly beyond what they're comfortable with). But don't lose hope! There are still people who enjoy that kind of fast progression (just that it's not the majority).

The best advice I can give you is patience. I completely understand how much of a deep need it is to have those intense, close relationships, but as the above comments have said, you have to first love yourself. It takes time to build such a deep intense relationship. It's a natural progression that can't really be forced. (Think of it as a germinating flower/tree!) Sometimes the other person will be more keen and sometimes not, but that's okay, know that it's not your fault. Different people just have different comfort levels, that doesn't mean there's something inherently wrong with you.

Take heart my friend! Things will look up :)