Never felt so down about life

i'm going to go right in deep here so who ever can take the time to read this and respond, thankyou. for the past few weeks i have felt so, so bad. i'm 17 years old i got kicked out of school just after i turned 16 and have 0 GCSEs what so ever. i', currently working a crappy 8-5 job 5 days a week for minimum wage, i have no academic capabilities at all, i struggled in every subject because i can't pay attention, easily distracted, forgetful, and things don't really "sink in" very well, so that pretty much rules me out of getting any decent job. i have literally no interests except motocross and skydiving, i don't play other sports, i don't have any interest in engineering, constructioin that i fancy doing ect. i keep getting told to "get into the really world" and to lower my expectations, but i can't do that, i don't think life is too short, which means you should try and have as much fun as possible in the time you have, and fun is pretty much my only motivator in life. since i left school i only speak to about 5 people i went with, so not having many friends doesn't exactly help with me feeling down all the time, and i have no girlfriend and never have. Life is boring, i seem to be stuck at a dead end where i wont be going any further at all. please can someone help.

Helo dear.study is a best part of life .agar apke dost kam h ya nahi h so dont worry.i m also a person jiske zada dost nahi h.and its true life is not too short.but dear but dear you are a boy and you wil b strong.aap try kro dost bnane ki.sab kuch ek din me nahi hota h.koshish kro wo chize karne ki jo apko khush kre.help kro dusro ki jisse apko sukun mile..or study kro bcoz in future its very important for u..or acha h apki gf nahi h ..bcz aap apni life k malik ho so enjoy everyday

Thanks for the feedback everyone, i got my weeks notice at work today so i'll be unemployed after next week. Bummer. As for the motocross / skydiving clubs, yes there are some near me but skydiving is extremely expensive to do regularly and i have trouble getting to and from different motocross tracks, which is why i visit the same one but it tends to be just the same people. I'll be honest i don't have a lot of interest in mechanics or anything too boring for me i just enjoy riding