Role Of Different Hormones

Dopamine - This is attached to the reward circuit of your brain, so when people see/smell sugar, ciggerate smoke, and a good looking girl this chemical surges in and motivates you to achieve it asap, it the reward your mind and body wants to achieve.

Serotonin - When you feel down or sad for no special reason, it's an indication your serotonin levels are going down, it's basically a mood regulator hormone, which helps you relax and be calm.

Oxytocin- Also called the love hormone, as the name suggests it's plays role in social bonding and relationships, and gives a feeling of being loved & cared.