Why did you go to university for computing?
How are your grades?
Is it combined with homesickness at all?
I think if you are sure that you don't want to have anything to do with your degree in the future, and if your grades are visibly suffering as a result of your struggles with the work, and if isn't solely an issue of homesickness - leave. What are the reasons for you to stay? There is no point stressing for three years if you honestly think it is too hard - particularly if you're in first year, as it may only get harder. But I think you just have to look at the factors. If it really is an inherent inability to connect with your degree and understand the work, achieve well with it, don't waste your time and money with something you already know you don't want to use in the future.
Your university will have a careers department, I think you should consider talking to them, or the university counselor, about these issues. It would be best to talk to someone in person who is set up for this discussion as opposed to strangers on the internet. You don't want to make any rash decisions, but you also don't want to be told to just 'suck it up' or something, I'm sure.