De mi vida Sobre mi vida

Very good!

De mi vida (That's fine and that's actually what I would use here as well. However, you could also put "sobre mi vida" )

Hola, mi nombre es Ransom. Soy de Nashville, TN. Tengo veintiún años. Soy estudiante universitario. Estudio inglés. También, soy un escritor y un bloguero. Me gusta tocar el saxofón y leer literatura. Yo (It's ok, but it's not necessary to repeat "I" that much. Usually Spanish speakers try to skip it. If you put the form into the correct declination that's quite enough for us to know whom are you talking about: I-yo, tú - you, etc") aprendo español porque quiero viajar a España y hablar con los habitantes. 

Excellent, you have no mistakes. 

Just keep it up.

Have a nice day