I was shy. I didn't speak up in class. I was extremely anxious and nervous when I had to take a public speaking class. But I loved home economics and learning those skills increased my confidence. I was anxious when I started student teaching but when I had success doing that my confidence improved some more. I taught for 3 years and decided to change careers.
When I applied to be a police officer one of my references said that she doubted I could do the job because of my shyness. I was still shy out of the classroom.
Then I was accepted for the Police Academy and I had to come out of my shell simply because everyone else was so outgoing and we were required to role play.
Sometime during that time I learned about positive affirmations. I learned that what we say to ourselves affects how we act. Here are some examples of things to say to yourself. I'm getting more comfortable day by day. I can smile and say hello to everyone I meet. Make some more specific. In preparation for a job interview, tell yourself that you are calm and ready for the interview even if you aren't feeling that way. Pick out a few phrases that say you are doing well and repeat them over and over every day. After awhile you will feel that way.
One of my favorite statements is "fake it until you make it." Your affirmations can be lies but the more you say them the more you will become them. Try doing new things. Yes, you'll be scared when you start but gradually you'll gain confidence.
My daughter joined Toastmasters. She was afraid to stand up in front of a group and talk. She's now very comfortable doing it. The group is very supportive. Lots of new members are shy.
As someone else suggested. Start out small. Smile at clerks. Then start up a brief conversation with someone. Perhaps just make a comment on the weather. Ask friends to let you practice talking with them about something in which you or they are interested.
Go on many job interviews; even to ones in which you're only marginally interested. This will give you practice. Practice does make being with people and talking easier.
Also remember that not all jobs require that you not be shy. Are you experienced in any kind of work. If you're a mother you may be able to find work in a day care center. You have experience with kids and thus probably have more confidence in that area, already.
You could join a group, such as a book club at the library. Or take your children to activities at the library and learn to talk with mothers.
Put yourself in the area with people and you will gradually be more comfortable.
Make a list of your strengths and look for jobs that use those strengths. And know that there are many others who feel the way you do. I"ve been waited on my shy clerks, waitresses and felt OK about their service.
You might also ask your therapist about medication for social anxiety. I think I took Valium for awhile when I was teaching.
You can get a job and be comfortable. It will take time. Start with baby steps.