Being a commerce student does not mean that you can not pursue a career in computers.
You can take up computers by opting for any of the following courses:
1)BCA-bachelors of computer application (3 years)
2)B.sc IT-Bachelors of science with IT (3 years)
For more information on colleges please log on to http://www.youngbuzz.com/colleges/fieldofstudy/all
Hope this helps.