Maybe telecom isn't for you. Maybe you'd find happiness in doing data science for an NGO that is saving lives in Africa, or an early startup that needs their second "data and data infrastructure" person to get the company bootstrapped. Or maybe not- that's just one thing you think about.
At the same time, nothing is wasted. You've learned stuff. Hopefully, you will continue to learn stuff your whole career, your whole life. If it happens that the first major skill you learned wasn't the one most critical to your career, that's okay.
Graduate with your degree. It serves as proof that you can learn stuff and not have your life fall apart for a few years.