A long conversation with my colleague made me realise that:

1. Having differences is not a bad thing. It makes you see things from different point of perspectives. So do hear the other person out.
2. Being idealistic is just being idealistic if you do not have the voice to make it heard. Speak up and make your voice be heard.
3. Self awareness is important. Without knowing yourself, you are a lost soul who confuses the people around you. Take some time to reflect upon what defines you as you.
4. Choose happiness. It's something that sounds so easy, but always trying to be optimistic and cheerful require a lot of practice. So do practice more, as it will come naturally once the practice makes it perfect. Let's not forget to forgive and not hold on to grudges.
5. Believe in love and faith. After all, there is a reason why all the religions preach that.

I am quite aware that sometimes easier said than done, but ah well... no harm in trying.