Try maybe slowing things down, take more time to think about things, start writing things down such as weighing pros and cons of decisions...this can help you to take small steps to improving your indecisiveness. Try writing 3 things about yourself and 3 things that you like (examples reading, playing sports) this will start you off on figuring yourself out and you can later expand on your lists.

I think it's a part of the process of finding yourself to be lost and not have a complete picture of who you are but that doesn't mean you can't start looking now !