I'm going to lie about being sick to avoid going out
Why would you lie instead of telling the truth?
I'm don't feel like drinking and I don't want people to think I'm a pussy
There's nothing wrong with wanting to relax at home every once in a while.  However, instead of just lying to give yourself cover to do so, you should own it!  Don't be ashamed of what you enjoy doing!
I would just rather tell a lie than face the truth,.
I think that it is fine that you want to stay home and relax instead of going out. I just think that you should be honest about it instead of lying.