No. Or maybe. Don't bother learning a language that you have no immediate plan to use. You won't remember much when you do need it anyway. You could as well ask if you should learn French, German or Chinese. Hey, you might need to read a technical paper in that language one day.
Is facility with some programming language useful? Of course it is. But you can do a heck of a lot with just a spreadsheet. And do you need MATLAB to handle undergraduate level ME classes? Not really, and certainly none that I ever saw. Only for some of my graduate school ME coursework would MATLAB have been of any use anyway. For my thesis, yes. But you are not even close to that point.
There are many other things you would be far better off investing your time to learn in advance. For example, pick up a copy of the text for what you perceive will be your most difficult class from your next semester. Read it.
Knowing MATLAB won't hurt you. But you won't learn it very well unless you are using it. And you can learn it when you do need it, and if you really do need it, you will learn it very quickly.
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