Tā nìngyuàn zìjǐ xiǎng bànfǎ, yě bù yuàn qiúzhùyúrén.
He'd rather figure it out himself than ask others for help.
Tips
grammar
于 here is a classical preposition meaning 'from / of / to'. 求助 = 'seek help', 于人 = 'from others'. The same pattern appears in 取决于人 (depends on others), 受制于人 (controlled by others).
