I used to be that way, before I got on medication and got some CBT.
Granted, I still have a lot of fears. But I'm able to socialize a bit, and leave the house and go to the store.
It was so bad at one point that I was promised a new phone by my mom (I was 24 at the time), and I sat outside the Verizon store and couldn't go in. My mom had to go in and get my phone for me, that's how bad it was. And I was looking forward to picking it out myself.
Now, I went into the Verizon store to get a new smartphone a year ago, and picked everything out myself and was able to ask questions. And a week ago, my screen protector broke, so I went back there and bought some new ones.