Anxiety
Anxiety. We all experience it at some point in our life. It's something you can't avoid, whether you're anxious about going on a roller coaster or you've got it from a previous experience, it can eat away at you. Some people can suffer from this particular mental illness quite severely, it always somehow gets brushed aside as an issue you just have to deal with and easily get over. It's nothing like that at all. This feeling can last a lifetime for some.