太过年轻承受不了太多誓言
[tài guò nián qīng chéng shòu bù le tài duō shì yán]
The meaning behind this is acknowledging that at a young age, one may make promises (such as vows of love or loyalty) that they're emotionally not ready to keep or fulfill, expressing a certain immaturity and lack of experience dealing with serious commitments.