I'm sorry to hear that you don't understand. You said "even though 'to' usually has future image" I don't understand why you think that "to" has some relation to the future. "To" does not mean the future. It is just a preposition. It can be used in many different sentence structures. Maybe you are thinking of the structure "to be going to do something". For example, "I am going TO learn English today" is talking about the future. However, in that example, it is the whole sentence that is talking about the future. The individual word "to" does not have any meaning. It has a function, but no meaning. I will try and explain the sentences to you another way (without using "to"). "I was surprised to hear the news" means "I was surprised when I heard the news". "I'm sorry to be late" means "I'm sorry that I am late". "It's good to see you" means "it's good that you are here and I can see you".

Hello, The preposition 'to' has many usages. I hope this explanation helps. https://www.thoughtco.com/how-to-use-preposition-to-1211798