You have male pattern baldness, you arr thinning at both temples and your hairline seems receeded just a little bit, I have the exact same problem you do (look up my previous posts) some members of this forum said nothing was wrong with my hair and a few even laughed at me. So I went to a dermatologist and she diagnosed me with Areata Alopecia on that one side, even after my visit with the derm, I still felt uneasy about the way my hair looks. So I made another appointment to a different derm and this derm seemed way more knowledgable she went over my hair with a scope and indeed I did have Alopecia Areata on one temple, she pointed out the circular pattern, BUT, and this is a huge but, she also diagnosed me with ANDROGENIC ALOPECIA.
Your hair looks similar to mines but a major difference is my loss was a circle, not a huge patch. You have the signs of male pattern baldness, do your self a huge favor and go see a dermatologist, if they say your fine than go to another one for a second opinion, the worst thing you can do is pretend your hair loss is stressed enduced and do nothing to stop it.