No period in Months

So I haven’t had my regular period since the start of quarantine. Some months it never came and some months it last for like 2 days but very very little flow. I’m not pregnant cause I’m gay and I’ve never had sex with a man. I’m only 23 years old. I know your period can be effected through stress which I mean who hasn’t been since corona started. And I have been losing and gaining weight very often. Idk if I should go to the doctor or not or if it’s anything serious. It’s been about 6 months since I had a regular period. I don’t really want to go to the doctor but idk if it’s serious or not. Any advice ?