Is it ridiculously hard to become a strip cartoonist (Garfield and Snoopy style)?

I'm a biomedical major looking to work with animals someday, but I have always wanted to be a strip cartoonist. I'm thinking of taking some art cles after I get out of my current school (the science major's schedule is far too hectic to take them now). Should I even bother pursuing this? I hear it's extremely hard to catch a break.