Is this a normal reaction concerning the identity of my father?

my mother is in denial about a lot of things; one of them being my father-whom I have never met. She NEVER wants to talk about him openly & prefers I know as little as possible so she sounds like a broken record most of the time. She said she had no pictures of him to show me, but she actually does. One day we were looking tru a photo album together & accidently there it was! I think she didn't want to show me because she knows I don't look like him. Anyway, Light-heartedly, I commented he didn't look like me and asked if she was sure he's my father. Well... she BLEW UP, turned red, cursed me out, screamed so hard that her voice made the windows rattle, and told me to get away from her....all while exlaming that he IS my father and I should believe her cause "she says so". I asked her why she was getting so upset & she said it's because I do not believe her. I didn't respond to her by yelling back, instead I calmly walked into the kitchen and said "i just dont think he looks like me." What do u all think? I'm 27. I will add that I have a very distinctive nose & no one on my mother's side has it; neither does this photo of the man she claims is my father. She seemed to have lot of different boyfriends over-lapping ach other back then. She has photos of all of them (none look like me). However, there are stange letters sent to me, actually TO me, in MY name, from a women in India from the time I was born & she actually has a similar nose, eyes, hair, ect. My mother reacted the same way (blew up) last year when I asked her who the woman was. I even caught her in a lie because first she told me the woman didn't know my name or even know I existed. Well, I had the letters to prove it. Also, two yers ago I had a DNA test that ironically I have medium ancestor pointsin the EXACT area where this woman sent the letters from!!! Can it all be "just a coinsidence"????? or am I just losing it.......