Yup its embarrassing for one reason and all the other stuff going on in his adult life is making it hard for him to admit it. Even if he does admit it then what? they date? even when his mother is still trying to marry him off and make him take over the company? And he may even want to take over the company in the long run instead of working on manga remember he loves literature. Theres also the fact that homosexuality is hard especially when your parents hold such a tight noose on you most of your life.
Onodera already confessed his love to Takano. The problem was that Takano couldn't hear him.... (it was raining) :v