Starting a business with the right mindset is very crucial today success of that business as if you have a mindset of you can't do it or you can't achieve it then definitely that business will definitely not succeed as you have already have a defeatist mindset.Never start a business for the sole purpose of making money, this is the quickest way to drive away potential customers and/or get burnt out.
Also, don't put so much pressure on yourself to matter to the world. You don't have to change the world (not right away). Just focus on a need and find out how to fill that void.