RE: what should i do
First let me say: Good for you. Don't get discouraged.
I think it was edison who when ask about being unsuccessful 100 times with an experiment said: They've all been a success. I've sucessfully found 100 ways that don't work.
Write your ideas down. Try to draw them. Go to your technical school and see if they have a CAD class, if they do try to draw your design to scale. Then find some gunsmiths and ask their opinions on your designs. They will be able to help you a lot. All of these things shouldn't cost you any money. Heck, you very well could be the next John Browning.
If you don't know who he is you should research him. Maybe you should research him anyway.
Best of Luck.