I can read the script, but I freeze up in real-time conversation

I’ve spent months mastering the Sinhala alphabet to the point where I can read signs and menus, but when I actually try to speak, my brain just locks up. I think I’m too reliant on the written word. I’m thinking of incorporating Chickytutor.com into my routine to force myself to practice live conversation and get over the fear of making mistakes in real-time.