Is it possible to have dejavu? because there are times where i feel like things happened before and it weirds me out

Possible: Déjà vu is an abnormal symptom and is seen in a number of psychiatric illnesses. What you are experiencing is probably not déjà vu, but rather what feels like it, although, you are not fixated upon that and you soundly judge about that. Patients having déjà vu as part of their psychiatric presentation usually exhibit other symptoms and are irrationally convinced of it.

Yes: Deja vu is a common experience and usually happens without the presence of a medical or psychiatric cause. If you are experiencing other more unusual problems, like feeling like you are not yourself or as if you are outside of your body and looking in, or if you lose time or find yourself somewhere not knowing how you got there, then seek professional help.