It sounds like you are putting a great amount of pressure on yourself. It is fine to have high expectations, but when it starts to cause anxiety and worry, then it can be a sign that you need to let up a bit. Have you ever talked about these feelings to your dad, since you think he is has certain expectations of you? It sounds like he is very proud of you, but maybe it would help if he understood the pressure you feel to succeed in your family.
Have you ever heard of the "Serenity Prayer?" It is used in 12-step programs and it is good wisdom to follow when we are feeling anxious and pressured:
God grant me serenity to accept the things I can not change,
courage to change the things I can,
and wisdom to know the difference.
Repeat this to yourself a few times a day and try to remember to take one day at a time.
Cynthia-Counselor