One Important Decision in My Life ( I )

Is diploma important for us? In my opinion, yes, it is. I worked for a medium-sized electrical company as a sales assistant in 1998. This is my first full-time job. I learned experience from this company a lot. However, I know this job is not what I want, what I love. I always think so, “How I can get a better work?” And “How I can find a job I am Interested?”
On that time, I had a High School degree only. Therefore, I decided to get a college diploma because I believe that only have a higher degree and can make it. However, I have problems. First, I cannot go to school during the day because I need to work. Second, I am unable to enter the college through the entrance examination because I am not good at other subjects except English and Chinese. Third, I am old at that time.