I'm trying to file business taxes for my business using turbotax like i did last year, but when i log in the default takes me to my personal tax filing portal?

Are you asking about TurboTax Business?  That is not an online program.  TT Business is a CD/download that must be used on a Windows computer.

https://turbotax.intuit.com/small-business-taxes/

You may also be able to purchase it from Amazon, Costco, Sam's, etc.

This link Where can I obtain authentic TurboTax software? has a list of authorized TurboTax resellers.

To purchase and file under the TurboTax Business software, please click the following link to purchase the CD/Download through TurboTax:

TurboTax Business

If you have both business and personal TurboTax programs you need to open the right program first before continuing a return. I always start by opening the program I want to use, then when it opens, click either continue a return or start a new return.