I recommend that, if you're finished with high school, to go and hang out at a bicycle co-op. Make certain that the red bike is not stolen and that you have a legal right to it. Take the red bike to the co-op, whenever you go there. Practice fixing and upgrading your bike at the co-op. Make friends there and learn basic bicycle mechanic skills.
After hanging out at the co-op for about 4 to 6 weeks (for at least four hours per day) , talking to and learning from mechanics. Go to a bicycle shop and volunteer your time after you know for certain, that you can fix a flat, true a wheel, adjust or change brakes, and adjust or change derailleurs. Also learn how to install a new bicycle chain. Those skills should get you through the door. After volunteering from 4 to 6 weeks, ask the boss if you can start working there part-time on the weekends. If he says, not at that time, then apply at Walmart, as a bicycle assembler, and keep volunteering at the bicycle shop on the weekends (eventually you should get hired).
Once you get your job, save your money and either get a better bike than either of the ones that you have, or upgrade your red bike.
Hopefully, you will become interested in the physics of cycling and you'll want to obtain much more information, by going to college, so that you'll be able to make twice as much money as any bicycle shop owner.
Education, honesty, and reliability are the keys to success...
Good Luck, kid!
- Slim
PS.
Also, the ability to focus upon a goal or objective is absolutely necessary for anybody to experience success. Otherwise, you'll just sit around wasting time and become an aimless person. Somebody that adults will find it difficult to befriend. Nobody wants a bum for a friend!