The last time i was sexually active was last year. i'd like to know if it's possible to get anal warts if you haven't been sexually active and why?

Yes, possible: Genital warts are caused by the human papillomavirus (HPV). HPV can be passed even when an infected person has no signs or symptoms. You can develop symptoms years after being infected, making it hard to know when you first became infected. In most cases, HPV goes away on its own, but sometimes it remains in the body and causes symptoms later, which you may be experiencing.