Doing research in difficult

Sometimes I rather stay in the office than go to the lab. The reason is not really clear. But I found out later that it is normal for every graduate student. Of course you will see some examples that people always get nice results and seems have no troubles doing experiments.

But I think the truth is : Nothing is easy. You will always face difficulty doing something. The important thing is that you should be strong in your mind. The past does not equal to the future.