Why do i never finish anything!?

My emotions fluctuate a lot, some days i can be really motivated !!! So motivated that i decide to start learning a certain topic, e.g. Lately ive been learning programming, before that it was italian. While im motivated i love it, enjoy gaining experience etc ... Then at some point my motivation completely burns out (always!!!!) i find myself thinking .... "What is the point in doing anything in life if eventually were just gonna die anyway" i mean i could put numerous hours into programming and maybe eventually make my own game!! but at the end of the day, when its all said and done and all that effort has been spent ... Will it really matter ?! I think not.

I really wish i could just be consistently motivated and finish what i start, how can i do this? Any life tips haha ?

Sorry if i have rambled and thank you to anyone that has read/answered this, i appreciate it. I also apologise as i didnt know what category to put this in.