Congrats on an excellent start to becoming an entrepreneur! Being here (on Clarity) and jumping in and asking a question (versus just lurking) is a great sign that you are willing to take action.

Here are some of my initial observations and suggestions...

1. Begin with letting go of any assumptions or hangups you may have (or may think other people have) about your age.

2. Consider that the money is only one of your resources. Now write down all of your OTHER resources before you start putting a plan together.

3. Answer these questions (for yourself AND the next time you post a question try to be more clear):
What does "realistically" mean? And in what time frame? And how much risk are you willing to take? And increase by how much?

The best advice I can give (though unsolicited) is this:
When asking a question - make sure you are very clear about what you want AND make sure you are providing sufficient information about your goals and situation.

Best of luck to you!