nǐ / bié / tài / dān / xīn / zhè / jiàn / shì / xiǎng / de / kāi / jiù / méi / shén / me / dà / bù / liǎo / de

你别太担心，这件事想得开就没什么大不了的。

Don't worry too much; if you can take this matter lightly, it is no big deal.