hesitant
adj
tending to be slow inspeaking or acting because of uncertainty or unwillingness犹豫的; 踌躇的; 迟疑的
a hesitant reply, manner, voice, speaker 犹疑不决的回答、 举棋不定的样子、 结结巴巴的声音、 说话吞吞吐吐的人
I'm rather hesitant about signing this. 我不大愿意签这个字.
So, celebrate your success, and invite your parents to celebrate with you, however hard it may be for them. If you continue to be excited about your future, you may come to educate your parents in the same way.