I have this issue, I started therapy and I think it's helping. I think a part of it was not being encouraged as a kid to try new things while also being discouraged a lot. If every time a kid is excited or passionate about something that passion is met with indifference or pessimism I'm pretty sure they internalize that shit. At least I think I did.
Speaking from my own experience, therapy has merits in its ability to bring about awareness of my own way of thinking in life and how I came to think that way. While it's valuable information to understand where it began and how it's affected my life since, I've yet to see any deliverable come out of doing therapeutic work as a result. I'm curious to know, in what ways do you see therapy helping in such a broad issue, in your experience?
For me it helps me notice those thought patterns in day to day life and understand them so I can understand they are unhealthy and I should go the opposite route. For example I have an irrational fear of being ridiculed or belittled so whenever I feel myself pulling away from a social situation I can remind myself that I'm not doing that for any logical reason so I can change the behaviour. I've got another friend who gets anxious in social settings, understanding the problem helps him understand the anxiety comes from his past not his present so he should do the opposite of what his anxiety tells him in order to be happy.