My father is characterial, controling&doesnt believe in psychiatry. should i bring up bipolar diag or am i better off living hiding this part of me?

No. Don't hide it.: If you feel that your mental status is affecting your day to day life activities, then i would go and seek professional attention.

Talk to someone : Unless someone knows your particular circumstance, family history, dynamics it would be inappropriate to offer a specific answer to what you should do. Talking to a psychologist who would take some time to understnad your family, relationship with your father and what else is going on may help to come up with an answer as well as maybe role play how, and decide when.

It's your life: Discuss the pro's and con's with your doctor or therapist . Decisions like this should be based on a full understanding of the relationships and ramifications involved. Depending on your dad's character pathology or beliefs , it may be possible to take him to a session with you to see how the real world , and not his preconceived notions works. We all want parental understanding but it's not 100% achievable.Best wishes.

Find support: Throughout our lives it is normal to want to please our parents. Therefore we do not want to disclose anything that might lead to a rejecting response. It is important to surround yourself with supportive people. Also examine if there might be hidden motives in sharing this information with your father? I would seek out a therapist that can work out some of these issues with you.