How to overcome Depression?

Hi I am a software engineer. I am unhappy most of the times. I try to stay happy but I can't. I can't see growth in terms of job what i do and it may be me less because of that. This thing makes me sad. Also i am 23 and getting bald 50% . I tried all but even all Drs say uts genetic. Another thing i got many hair in my body , more than normal. I sometimes feel suicidal as I dont understand what is purpose of live such Aweful , shitty , and depressed life? And why this bad happened to Me only? Any help is appreciated !
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Update : I am not yet married. Eont know will it even happen!
How to overcome Depression?
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