RYL Forums - i feel lost, confused and stressed, help

Hi everyone, new to the forum and i need some serious help, this will be a long read so please bare with me and if possible share some advice.
if this is in the wrong thread i appoligise in advance.

I'm a 17 year old guy from the UK, for the past couple of years i have been extremely stuck and depressed on what i am going to do with my life, where i'm heading, and what i'm going to do and achieve.
i was never good accademically, infact i was pretty bad at school, i had only a handfull of friends due to social anxiety and feeling extremely uncomfortable making conversation with people, i got kicked out of school half way through my second year of high school, i left with no GCSE's at all, i have 0 grades, the only "certificate" as such is a bit of paper congratulating me on doing a bungee jump (some achievement ey?) i never enjoyed school, no subjects what so ever, i always did try but i struggled alot trying to keep focused and concentrate on anything that was going on, everything just kind of went into my ears and vanished as soon as it went in.
apart from all the mandatory subjects i had to do in school (english, maths, science ect) the optional ones i dont where engineering, art, and construction) they made me so bored, my mum has told me why don't i become a builder or something along those lines, but she doesn't understand how bored i get, i get extremely frustrated and stressed out when i get bored so i could not possibly have a career like that.

the only hobbies i have include anything to do with extreme sports, Motocross, skydiving, bungee jumps ect ect, i have been told okay so you like motocross? why don't you become a bike mechanic? but as explained before it is boring, and all i find fun is bike time. i rarely watch TV or play videogames anymore because i can't physically bring myself to sit still and do it, i don't know why but thats jut the way it is.

i have one plan for my life, the royal marines, i find this is the only hope i have of doing something good with myself, but i keep having setbacks, i broke my foot twice the same year, i damaged my neck which set me off working out for 3 weeks, and now i have back problems which again is going to stop me working out to get fit, but obviously i need a plan B, i could fail or not get in because of medicals or anything like that, there is alot of possibilites, so if that falls through what next?

i've worked 2 jobs in my life, washing dishes in a restraunt which i am never, ever doing again, extremely boring, and my most recent job which i just left was building artificle trees, i done the same thing over and over again for 9 hours a day, 8-6, 5 days a week, the task at hand would take around 4 minutes each time, and i done it over and over again until my day was up, i couldn't cope with the repetitiveness and tedious boring work.

i have no girlfriend, i've had 1 in my entire life, 17 years and i've had one girlfriend, i'm still a virgin, and extremely self conscious, i always feel like people are looking at me and judging me , i never used to care i used to just brush everything off when i was younger but since about 15 years old it has been completely different.

what can i do? i need help, i have been sitting on the internet trying to figure out a job that would suit me, trying to figure out how to become a millionaire, i've looked at jobs abroad, you name it and i have tried to look for it but so far i have nothing.

PLEASE share some advice