Just wanted to find out if anyone feels the same things I feel everyday

Somedays I'm like a monk, carefree whatever anyone does to me I don't care I forgive them I'm happy people love being with me people think I'm a very kind person. Some days I'm a depressed man drinking alcohol thinking life has no meaning, that I'm not significant in this world. Other days I'm ruthless and unforgiving and ill hurt anyone at all and I get mad at Super small issues even tho just the previous day nothing could make me upset. Some days I look in the mirror and feel good some days I look in the mirror and wonder who is Infront of the mirror. I look back at old pics of me and I see that my face seems to change drastically within a few months. Some days I feel good some days I'm down. The only times I feel "myself" is when I watch a show intensely and I kinda absorb the personality of the character and temporarily become that character until I get bored of it or I can't keep up with it and I either start switching between characters or I become character-less and I start getting depressed. Let yall know my mood and personality changes happen every 2-3 days. I feel like I have bpd but I was diagnosed w bipolar disorder 3 years back but it was only after 1 session so I think they mightve gotten it wrong. Anyone else have the same things and how do u deal with Yr whole personality changing every day