If you are living true to yourself and your inner drivers (and not purposefully trying to hurt others) then you never need to apologise for being yourself. If you are chasing your dream, doing what comes naturally, and being yourself at all times then others just need to accept you for you. If they cannot do that then they are simply not worthy of your time. People who want you to change, or want to belittle your thoughts and dreams, or just want you to stop being yourself are not healthy people to spend your time with. These attitudes are negative and poisonous and they will constantly degrade your life if you allow them to exist around you. Do not do this. Do not let these people and these attitudes in to your life. If people cannot respect you for being true to yourself then they need to be shown the door.
This is not heartless or callous. This is simple fact. Our lives are ultimately an individual experience. We share many of our experiences with others, form relationships and so on but ultimately we are all individuals who see and experience the world in our individual way. We are all individuals operating with our own set of ideas, thoughts and beliefs and as such we should never sacrifice that individualism to please others.
If you are willing to sacrifice your own identity for the sake of others then you are just letting their view of the world, and their ideas and thoughts, take precedence over yours. Why? Why should you take on their values or their set of rules for how to behave? Why does their view mean more than yours?
By changing yourself to suit others you are essentially saying that your own view of yourself is wrong and that others know and understand you better than you do. But it is you, and only you, that lives with yourself 24/7. No-one else sees or experiences the world in the exact same way as you and no-one else is inside your mind, observing and responding to your experiences within the world. That means that no-one else is in a position to ever fully understand you as much as you can understand yourself.
That is not to say that people will never understand you. The basis of forming healthy relationships is that you connect with similar people on various levels and this connection implies a deep understanding of each other. But, as close as you can become with others, and as much as they can learn to understand you, it will never be to the full amount to which you understand yourself. Only you see the world through your eyes, so only you know exactly what is happening within your world.