The concept of vocation lends itself to various interpretations and therefore can confuse. We can use the word vocation in different ways, at different levels. There are, for example, "vocational" schools; it is said that someone has "a lot of vocation" for some trade or profession; if a boy gets out of the seminary "he had no vocation". And we also talk about "marriage or religious vocation". What are we talking about?
The word vocation comes from Latin: Vocare, which means called. Feel a vocation is tantamount to saying that someone is calling me. Otherwise, it doesn't make sense.