I want to talk about myself, but I am frustrated that I don't know what to say.
myself = 自分自身
frustrated = もどかしい、欲求不満な
what to say = 何をいっていいか
I want to talk about myself, but I am frustrated that I don't know what to say.
(私のことを話したいが、何て言っていいかわからないのがもどかしい)
となります。ご参考になさってください。