It seems to come with the territory. You are a modern woman with talents and a need to be validated outside of the home too. Do some things for yourself so resentment, guilt and stress won't get the best of you, every once in a while treat yourself to something just for you. You can be a better mother and performer on the job when you are taking care of your personal, physical, leisure, spiritual and emotional needs. If you continue feeling guilty and stressed, your child will pick up on it and this can work against you.
Children are small and full of wonder, innocence and joy for such a short time.
After that period they become adults for the rest of their life. Try to enjoy this time with your son. Make the time. Make him a priority. Parenting is about love and sacrifice.