Dear Mark,  

To answer briefly and to give you something to go on let me say this, you cant figure out if you have a vocation! All you can figure out is that you might have a vocation. Once you figure out you might have one, you have to start doing something towards finding out if you do have one. You see, figuring out is something we do in our minds, while finding out is something we do by looking, asking, trying. Two things are needed to figure out if you might have a vocation: to have the question come into your mind with certain insistence, and not to have any real, objective impediments. (These are not the same as obstacles. An obstacle is temporary - for example, if you are in debt or not old enough - and an impediment is permanent.) If you want to go beyond that and find out if you really do have a vocation, you have to start asking questions, looking, visiting; in short, you have to do something.

The first thing to do is pray for the generosity to not place any obstacles to your vocation, through attachments to anything that is not God and his work. The next thing to do is to ask yourself is there any type of priestly work that appeals to you especially (parish work in your diocese or missionary work, education, contemplation, etc.).. there may be a priest you know that you have thought to yourself, "I would like to be like him," or a particular group and their spirit that you are particularly attracted to. Then follow up by asking somebody involved in that vocation how you can get more information, visit, and get some spiritual advice. Getting your own spiritual director's advice will be very helpful as well. Happy searching; I hope and pray it will be fruitful.