Help please about marriage

My family is Sunni and I lean towards Shia islam. A shia man has asked my dad for my hand in marriage. It has been about 4 months since they met. The shia man has great character, respectful, and religious.

My dad has had so much trouble accepting this and has ben ignorant towards it and is now thinking about telling him that his decision is no.

I really want to marry him and want my dad approval. My dad likes him except for the fact he is shia. From his background and the way shia has been negatively portrayed to him throughout his life, it’s been difficult debunking the stereotypes because i ultimately think he does not want to accept a new way.

I plan to tell him I want to marry a shia one day just because of the truths i’ve found. My dad ideally wants me to marry a sunni, because how it isn’t common culturally. It’s been hard i’m running out of ideas to get him to come to agreement.

I’m open to all advice, help, suggestions, and more. Inshallah what God had planned will happen.