Learning another language—Japanese

In this semester, I learn the second language—Japanese. The reason is that some people talk me that if you just know English, it’s not enough and you would confine yourself to the same place. Besides, there are some similarity between Chinese and Japanese. for Chinese, it’s easy to learn Japanese because the formation of Japanese derived from Chinese. But since I learned Japanese, I have found it difficult stress the word and there are some strange sound, especially the origin—English. Oh, my goodness, I don’t want to learn it. Now, I still learn how to reshape my English ability to the fullest, regardless of speaking or writing. Then, have I had much time and effort to invest to learn the second language? Even if I did it, can I master Japanese or just know the superficial concept? It seems to be so tough for me to make the decision.