One of the signs of a vocation is a desire or attraction to that vocation. And most people will receive a vocation to marriage, so it is likely that you are/will be called to marriage. At the same time, desire isn’t sufficient for a vocation. For example, a man may want to be married but have impediments to marriage. A woman may want to be a nun but be rejected by the religious orders she applies to. These are good indications that such a person is not being called to the vocation they initially find most desirable.