Thank you all guys.I really appreciate your thoughts.My master courses are not though,but projects take a lot of time.However,I prefer to make researches and write a thesis statement istead of doing the excel work.I mean,dealing with the same thing each day is not for me but a research world is huge and there is always something waiting to be discovered which dedicates me to the Phd.Nevertheless,to develop a great interest is not sufficent.As some of you said,I think I need a research experience then I can give a better decision.