句子使用need to结构表达必要性，并通过drive sb toward doing sth体现目标带来的推动作用。
Dear self, you need a goal.
You have already begun to realize that the journey toward a goal is not always exhausting, so please keep chasing it. It could be a city, a school, a person, or a dream. In short, you need it to drive you toward becoming a better version of yourself. As the distance gradually closes, all the hardship will become worth it, won't it?
Dear self, in the days to come, please practice self-discipline.
Staying off the internet won't shorten your life, the books you love won't go out of print immediately, and your phone is not part of your body. You can live just fine without them.
And regarding those frequent outbursts of emotion, please learn to control your mood.
Whether you have experienced setbacks or are still dwelling on the past, please stop struggling aimlessly. You know where you failed before, so you cannot afford to fall again.
Please remember that the people you meet now are not necessarily for a lifetime, and the pain you feel now is not a life-ending crisis. There is still a long road ahead; now is not the time to give up.
You may have someone you love, but keep them in your heart. When times are tough, take just one minute to think of them, and then remember that they are also working hard. If you don't persist, you will drift further away from them. So, keep going.
亲爱的自己，你需要一个目标。
你已经初步体会到，为目标奋斗的道路并不总是令人疲惫，因此请继续追逐。它可以是一个城市，一所学校，一个人，或者是一个梦想。总之，你需要它来激励你成为更好的人。随着目标逐渐临近，所有的辛苦都将变得值得，不是吗？
亲爱的自己，在未来的日子里，请务必克制自己。
不上网并不会折损寿命，你喜爱的书籍也不会轻易绝版，手机也并非身体的一部分，脱离这些，你依然可以生活得很好。
还有那些时常泛滥的情绪，请你学会控制自己的心情。
无论你是否曾经历过挫折，或者仍在纠结于往事，请不要再原地挣扎。你清楚自己曾败在哪里，因此绝不能再次跌倒。
请记住，现在的相遇并不代表一辈子，当下的痛苦也并非生死劫。未来的路还很长，现在还不是沉溺其中的时候。
你可以有心仪的人，但请将她珍藏在心。在难熬的时刻，只需花一分钟去想念，然后记得她也在努力，如果你不坚持，就会离她越来越远。所以，请务必加油。