You should learn English because it is the most spoken language around the world and a lot of people know English. You should also learn English because someday you may plan to come to America and since the majority of people speaks English, you will be lost and won't be able to get around.
对了, "会汉语,英语和日语" does not make any sense.
Do you mean, “我会说汉语, 英语 和日语。" ?