If I'm questioning if I'm bisexual or gay, should I come out to my parents? should I wait until I know? I just don't want people to think it's just a phase if I decide to change my label in the future

Sharing the experience of questioning could be good for you in order to be supported in this moment, but if you prefer to wait and be sure, it's also ok! It's totally up to you, there are benefits in both decisions. In case someone thinks you're just going through a phase, you can try to explain what questioning really means, those who are willing to listen and learn will understand.