There is one person in this world who has been with you through all things: seen your downfalls, your achievements, gave you the courage to ask that guy/girl out, struck fear in your heart when you knew you shouldn't have been doing something, motivated you, stopped you in your tracks, loved you, hated you (more like frustrated though), but ultimately wished the best for you in all conditions and circumstances. That person is you.
While it may seem selfish it's quite wise to invest your time and money in that person; it's tough living with them at times but you can never leave yourself; don't even try to escape - it's cowardly and impossible. Make that person happy and do your best with what comes your way - always with a smile on your face and determination in your heart.
Here's how you invest: if you want to learn another language then take classes, read books, travel to the native country, actually use what you learn; if you wish to be more social then go to a club or coffeehouse or library, join a group, create a group, spark conversations with strangers; if you want to design and build something then draw it, research similar projects, get the materials, play with trial and error, build it and learn from it then tweak it. There is a difference, though, between being picky and doing your research - pickiness stalls progress in vain while research shows caution in the midst of a storm (life isn't a peach).
Now there are good and bad investments, but I cannot possibly say what they may be; vague and biased opinions are the best I can give. The difference between the two, however, are nothing like blurred lines; you'll know.
In the end, however, share this person with the rest of the world. Neither hold this person exclusively to yourself nor purely give them to others; the former allows for no growth while the latter gives no time for one to find themselves. I guarantee that if you make good investments, this person needs to be shared with the world. Not only do they thrive in the world but so do they inspire others to make the same investments.
Spark change. Fuel drives. Live to love. And love to live.
"Here's to the crazy ones, the misfits, the rebels, the troublemakers,
the round pegs in the square holes... the ones who see things
differently -- they're not fond of rules... You can quote them, disagree
with them, glorify or vilify them, but the only thing you can't do is
ignore them because they change things... they push the human race
forward, and while some may see them as the crazy ones, we see genius,
because the ones who are crazy enough to think that they can change the
world, are the ones who do." - Steve Jobs