It is relatively common for students to change their majors during freshman and sophomore years. It is not unheard of for students to change their majors later than this. However, the later that you change your major, the more likely it is that it will take more than four years to graduate.
I have heard of cases of students taking a class at a community college over the summer to catch up on their required courses due to a change in majors.
I also have heard of students transferring to in-state public schools due to a change in majors. The issue here is that most scholarships only last for (at most) four years of classes. If a change in major results in a student needing more than four years to graduate, the fifth and any subsequent years can for some become unaffordable. However, in-state status and in-state tuition will generally last into the fifth and if needed sixth year.
Usually people who do well in computer science were good at math. Does this apply to you?
Art is IMHO a tough way to make a living.
Also, some students take time off from university and work for a year or two to figure out what they want to major in. Life is not a race. It is more important that you get to the right place, and not important that you get there quickly. It is however, important that you do not run up too much debt before your figure out your major and graduate.