What you ask seems to be a potential contradiction; if you are blowing your things out of proportion, then they aren't as "serious" but if they knew what things were there, they wouldn't want to be around you (which sounds serious).

Since it's your thinking/feeling at stake, not what the other person has actually indicated or said since you haven't revealed what the things are inside you, I would deliberately "pick" one thing to believe and go with it.

If you want help with your feelings/"things" then they are as serious as they need to be. Maybe you do make mountains out of molehills, but that doesn't matter here, because that, in itself, would be a problem that you would want help with? See? Nothing is too "small" or "bad" to want help with. And, wanting help cannot cause a helper person to not want to help you?