Is there any way to be an honest lawyer?
I do not believe that to be a lawyer you do not have any morals - I would never have become a lawyer if that was a qualifier. Every attorney makes his/her own path and reputation by the manner in which they conduct themselves. I think that I am a very good lawyer and I can say that I have never done anything in my legal career that would not allow me to look myself in the mirror and be proud of the lawyer that I am. I also have a reputation among my clients as being very trustworthy and am held in high regard for doing the right thing. Don't be deterred from a legal career if that is what you want to do. Make yourself an attorney that you can be proud of. Have high morals and standards and never deviate from having them - do what is right always. You can always choose not to take a case if it is going to cause you to have to behave in a manner that is against your moral fiber. Just like every occupation there are some bad eggs in the legal field and unfortunately those are the ones that you see on TV and being disbarred, etc., but you can be a good moral person and become a great lawyer. Follow your dreams and be good and moral at whatever you choose to do!!
You mentioned debate, so I am assuming you want to be in court - there are many kinds of law you can practice on both the civil and criminal side. Law has many specialties, so consider which field of law you are interested in. If you are serious about becoming an attorney, get good grades in college and prepare for the LSAT. After you get into and eventually graduate from law school, you'll probably face a few scenarios where your morals will be tested in small ways (ex: accurately marking your time sheets, billing clients correctly, completing pro bono requirements of a firm, etc.) - but if you stay honest in the small things, you'll have the practice and ability to stay honest for the big things as well. As a former attorney, I hope to welcome you to the legal profession soon!
In any field you opt for, it is your own conscience which decides whether you want to be honest or not. Work with integrity and honesty always, whatever your field and you will always be happy if not filthy rich. End of the day, it is what matters to you that matters. A clean conscience never hurt anyone. All the best for a fantastic future :-)