Boyfriend

Idk how to say how I feel about my boyfriend out loud , I can say I love him but I can't say other things for example I can't just straight out say you're the best thing that ever happened to me bla bla bla like I can write my feelings down like there's no tomorrow but I have trouble saying them out loud and he wants me to do it and break that wall down but idk how to do it ; someone please help and give me advice on how to handle it and let go of everything that made me this way 😔