Hi Tiffany,
i did that 😀
Used a cheap, extern USB Soundcard and Technics Tape Deck.
Good quality internal Soundcard was just too noisy ... you heard literally your computer working 😉
Those Walkman style converters are not good as reported from a friend of mine.
Noisy as hell. Well, its some years ago but i dont believe they became better.
As i switched from Soundcard to audio interface, just bought some extra cables to become the signal from tape deck.
So the first question is: do you still have a tape deck ?
I guess you have an adio interface 😉