I would add that it's a handicap with no accessibility. Many designs are undertaken with physical handicap, disabilities and disorders in mind. Rarely is shyness accommodated in like fashion or treated as a handicap to be accepted. The prevailing sentiment is that it's a feeling that can be outgrown (eg. we often hear the phrase "don't be shy" as if it's something a person has complete control over).
It is something that you have control over though. Unlike an amputated arm, you have the ability to make a choice to eschew shyness in favor of some outgoing mode of interaction. It's not going to be pleasant initially if you're not used to it, but you still have the choice to take that action. You might even choke up due to a nervous system response that actually is out of your control, but that response can be dampened with practice.
I say this as someone who generally has difficulty socializing, but I try regardless. It gets easier.
