[Sumippi]

>Atashi wa seito ga college desu. Shumi wa uten suru to yomu suru to e suru to uta suru..nantoka nantoka!

Hmm...I'd say

(W)atashi wa daigaku sei desu. Shumi wa unten suru koto, hon o yomu koto, utau koto, e o kaku koto...nado desu!


>Seito ga college da. Ano...shumi wa uten toka yomu toka e toka uta toka..ano..nantoka! Hai~ Tomodachi wa sugoi!

Forget about 'Seito ga college da/desu'. It just doesn't make sense.
I'd say

daigaku sei da yo. Ano/eeto..Shumi wa unten toka, hon o yondari, e o kaitari,..eeto...hoka nimo iroiro! Hai~

etc...