If I was born in Rome, lived my teens in Miami and then moved to Jakarta at 25. How many kilometers have I traveled in my life? In your estimate consider also daily commuting, I have always lived 30 minutes from school by bus. Now I'm 28.
If the speed of a school bus is about 50 km/h, and you live 30 minutes away from school (1 hour there and back), then you travel about 50 km per day. Since you go to school about 200 days per year, and you are 28, you have commuted about 28 years * 200 schooldays/year * 50 km/schoolday = 280,000 km. Rome is about 9,000 km from Miami, and Jakarta is about 18,000 km from Miami, so we can add 9,000 km and 18,000 km to the total to get 307,000 km.

That's just an estimate though. You only specified school when talking about your commute, so I didn't include the distance you probably traveled when going to work, going out to eat, going to the movie theater, etc. If we included those factors, the total could very well be double what I calculated.