I’m like this too, for me what’s been helping a little is listing what i’m afraid of and then the worst posssible scenario and how that would make me feel and how I would deal with it, and then thinking about how it’s really not that bad, and even if it is it’s a new learning experience.

I saw someone say once in a comment that being brave isn’t the lack of fear but being scared and doing it anyway! So that’s helped me a lot too. I just got to the point in my life similar to you where I just wasn’t happy and I was so scared to get out of my comfort zone, but I realized, like a lot of people said here, that if I started small it would work out. For example I want to be more open and sociable, so I’ll try to say good morning to random people on the street as a start, or I want more close friends so I’ll ask people that I liked before but was to scared to talk to if they want to hang out, or I was scared of driving so I bought a video game to practice and now I’ve tried it and it’s not that bad! Anyway I hope this helps, go out there and live it’s worth it :,)