For the mere fact that there are 7 billion people in this world, there are millions and billions of examples of the possibilities that exist, so it just really isn't a reason why you doubt possibility.
Why doubt your self? Why speak negative about yourself? Why focus on what you're not? Why focus on what you don't have? Why stay in a situation or around people that bring out the worst in you? Why contribute your age, religion, sexuality, or even color as the reason to support your limiting beliefs? Why?
See if you didn't know any better, if you had no model or awareness for possibility, it would make sense. But the very fact that you're reading this post means you have access to a magical portal that allows you to look up any piece of information you have a desire to learn more about. Think you're too old or young to go to school? Invent something? Travel? Start a new career? Start a business? Make a difference in this world? Think again.
The special function of our brain is that it continues to be available to receive and process new information. Your brain doesn't know your limits, your mind creates that false reality. Once you are exposed to a new experience whether its read, heard or even seen on TV, it creates a new neuron connection and thus a possible occurence in your brain. Therefore if you want to do something, if you want to be something, just look for an example around you, and begin to believe in yourself.
It can be something as simlle as completing a 5k. Are you out of shape? No problem. There's someone with more medical conditions and older in age whose completed a 5k. Don't think you're smart or wealthy enough to start a business? Please. ..just look up stories of entrepreneurs online or in books. There's thousands of accounts dedicated to profiling entrepreneurs.
Self love IS about accepting all that has happened to you, it is NOT creating visions of what you think is not possible.
Having some issues around self worth? Having some issues around self esteem? Having some issues throwing away the negative self talk? Its ok. Work on yourself. Work on your mind. Work on your spirit. Forgive yourself. Practice the 5 Commandments of Self Love.
Every one has a different journey and yours is perfect for you.