How can I see or know if i’m depressed?

Another viewpoint: from childhood, life is big, scary, and unpredictable. We suffer mini traumas, and more often big ones. Our psych systems respond to protect us by shutting down (dissociating). We then fill in the blank with a fantasy of who we are and how life should be. With some money and the support of others joining in the fantasy, we stroll along happy. Then, a song, a movie, a death, a job loss, a divorce, a neighbor gets a big bonus-promotion and moves away, a re-experiencing of the old trauma, and BOOM 💥 Reality breaks through. Reaction Anger turned inward is depression.
Solution: embrace the Reality and live in Reality, and/or embrace the Reality and make a new Fantasy to live in, but remember......

Depression is having thoughts of past experiences and anxiety is thoughts of future.
Everyone swings between the two, the hard part is knowing what your triggers are when you feel or have depressive thoughts. The goal, stay present, centered.

Be careful with being put on any meds as it can make things worse. Be sure to get CBT/talk therapy and understand what is causing it and the tools to help you cope and get through tough days/times. It’s hard active mental and physical work but a ton better for your mind and body than popping a pill to feel better. Life is always challenging us, just know that it takes time and a lot of work to get through it.