It's all about positive thinking, you're thinking you'd like to be rich which is a positive thought, but then you also think it's unlikely that it will happen which is a negative thought. One cancels the other. The brain is the most powerful tool we have, but it has to be used very carefully. Your subconscious hears what you'd like but also hears that you don't expect it. Try just thinking positively that you'd like to be wealthy and follow that with more positive thoughts as to what a wealthy life would look like. Don't know if you're interested, but one of the books I was instructed to read was The Power of Your Subconscious Mind by Dr. Joseph Murphy. It was very enlightening for me, and I have reread it several times. It takes a while to retrain your thinking, but it is possible.