No. Not just you. Really not.

Re serotonin hypothesis and depression - I knew it was never really proven, but it wasn't until I met my pdoc/T that I found out exactly how much of a myth it is. It is something he feels quite strongly about so he can talk about it at length, if asked about it. (He prescribes antidepressants - he's prescribed some to me - but he avoids SSRIs. They appear to work for some people though nobody actually knows why, but in his world, the possible side effects are not worth it, especially since the "serotonin effect" is nonsense. The problematic side effects thing is one point where I do not find his point of view defensible at all, though. (That being said, SSRIs have never helped me, and the medication he has prescribed for me and which I am currently on is not a SSRI.))