Almost everyone is broke and inexperienced at age 18 man, the point is whether you are still broke and inexperienced when you are 28 or 38.

Living in abundance at young age sometimes stops people from carefully thinking what in their life is important

It is really great that you have figure out your future path I think you really should continue learn and practise, you may not necessarily need to work for some established companies, there are tons of open source project that you could take a look.

I wish I can figure out my path when I was 18 man, good luck.