I’m not sure from your post if you mean you are just going to stay at the Jesuit university for 15 days or if you mean in 15 days you are traveling to the Jesuit university where you will attend college for a few years. Forgive me for not quite understanding the English.
If you are only going to be at the Jesuit university for 15 days then you’re unlikely to find a good Catholic girl for a relationship in that short amount of time, especially given that you are probably going there for some educational purpose and not to look for dates.
Since you are 18, your best opportunity to meet a girl would be to attend a Catholic co-educational university for a few years, preferably one in your own area and culture so you don’t have any sort of distance barrier or other barrier, and then be active in the Newman center and other Catholic activities there. Many people meet their spouses in college as there are a large pool of people your age, many of whom are also seeking a relationship.
Good luck and God bless.