If I have the power to turn back time, I want to go back to the 2014, when I was 24 years old. = If I have the power to turn back time, I would go back to 2014, when I was still 24 years old.

That time I had my first job in AE.

If I turn back that time, I try to get another job. = If I turn back the time, I would try to get another job.

Actually my dream was news anchor. But I didn't try it. =  Actually, my dream was to become a news anchor, but I never tried it.

I chose my job just followed my major.So if I can back to that time, I try to do a test for anchor. = I chose my job because it was in line with my major, so if I go back in time, I'd try to do a test for an anchor job.