IMO Why do you want to re-invent the wheel, a lot of languages already exist and if you want to solve problems you can write programs rather than the language itself.
on the other side, good initiative, it is an interesting goal to have for oneself, 'writing a mini language of my own', but if you have lot of time left apart from spending time for your normal earning to live; you can very well spend time for this mini language.
even I have goals like 'take the latest linux kernel, understand it thoroughly, then contribute or write my own version of kernel' to call myself as a geek and to get some satisfaction for life/intelligence. But it depends on how much extra time I have apart from my earning for living a decent life.
I really admire those people who have already taken up those goals and lived up to that besides whatever struggles they face.
because If they have not taken these initiatives, we have nothing to work on now(eg, all open source stuff).
your this post is triggering lot of thoughts, at the same time I am not exaggerating anything about your post.
Vivek
-- In accordance with the prarabdha of each, the One whose function it is to ordain makes each to act. What will not happen will never happen, whatever effort one may put forth. And what will happen will not fail to happen, however much one may seek to prevent it. This is certain. The part of wisdom therefore is to stay quiet.