How can i gain confidence?

I am 26 years old. I've been shy all my life. people find me boring and think that I am a snob person because of my shyness.
I am always uneasy with people I meet. I don't know what to say to them all the time.
I am in a relationship. I was lucky...

enough to find someone who accepts me for who I am, but I always feel like I am letting him down for being too quiet all the time.
I feel like I was not made for this world. I want to disappear because I always let people down. that I can't talk to them.
I am crying right now, I don't have any strengh to do anything anymore.
people hate seeing me I want to run away form them. I want to apologize to have met me.
what can I do?
I feel like there is nobody in this world who can't solve this.

I know it's hard, but just accept that you are ho you are. Be happy and proud of who you are, once you show people that you dont care what they think, they wont care either.
Don't concerntrate on the fact that your so quiet, concerntrate on your realtionship with the friends you have and your boyfriend. They obviously love you already so you dont need to proove them anything. Once you become happy with yourself and the way you are, your confidence will start to shine. Just dont be scared to try new things and sho people who you are. Be prooud and love yourself.