Christians: why i should just accept?

Don't "just" accept. You need to be convinced that you have a sinful nature and that you need to do something about it. Once you realize you are in need of salvation, that's when Jesus will become real to you. But as other posters have suggested, there are impostors out there claiming to be the Messiah. They are not real, don't listen to them. That's why you need to search the Scriptures and learn the truth for yourself.