Escorts are a great way to have sex, but you need to be careful not to get an std - I suggest you wear a condom, even for oral sex. Once you have used them a few times you will be much more confident at having sex and also talking to girls at uni. Eventually you may even be able to pull a girl yourself and possibly have sex with her too. Don't feel guilty about having sex, we are animals after all, and even religious people accept we have sexual urges. At the end of the day there is nothing quite like a good shag.
What are the downsides?