自己的努力

It's great that you got into work in your 3rd year of university. You might loose something on your way to success, you will get compensated in the future.

今年大三学汉语的我已经进入职场打工，我赚的钱让自己很幸福。谢谢自己的认真努力，虽然成功的路上我失去很多，但未来肯定会回报一切给我。

I am happy for you. Congratulations on your new job.
天下 --> 社会 is a better word.
成功之途上拿了好多好多我的脂膏，但未来的生活肯定会把一切还给了我。
--> 成功的路途上我必须加倍努力，我坚信我付出的一切必将得到未来美好生活的回赠。