No period in almost 3 years

Heyy i haven’t had a period in a long time and according to the app its been 689 days since my last documented one. I dont have pcos or any hormone problems and never had a regular one but i did rapidly gain weight in a year. Im horrified of seeing an obgyn but will be facing the fear soon. I had a late start at 17 but im 25 now and used to only get it 3 times a year. Is this something to be scared about? My mom and friends keep pushing me to be horrified but im comfortable in my bliss of ignorance and no pain. (When i do have periods im bedridden)

Should i be concerned for my health?

(Had an ultrasound and theres no cysts)

I can count the periods i had in my life in my two hands

Also ive never used birth control