Can I use "we" in a text?
Short answer: yes.
Longer answer: "We" is actually used a lot in technical writing. But be aware of the conventions of your discipline i.e. check some articles /theses in your field and see if they use "we" and think of the style implications (see Active vs passive voice) for further discussion. Typically, more traditional fields tend to avoid personal pronouns like "we" whereas more recent disciplines, like computer science, use personal pronouns more. Also consider that although "we" is fairly common, "you" and "I" are not used very much at all.