what troubles do you suffer today

My only and only suggestion is to you to select the job of teacher. This job has high respect in the society whereas the job of salesman needs more skill , attention all the time. Though you may be paid more in salesman job than teaching job, but it has different position in the society. This is actually called service to the mankind. I have seen my friends who are salesman, spend all the time in tension thinking about only sales and sales. They talk on sale, they think on sale only.