Tequila is my favorite by far. I don't know if you want to mix it with much though. My experience is that cheap tequila & mixers are the problem, cause headaches, vomiting. Shots, of good quality tequila, a sipping tequila, will avoid the sick part, at least for me.

As to how crazy it makes you? Well that, like everything depends on the quantity. For me, it really does let down the inhibitions, but I have an inner control that won't let "the clothes fall off" or other inappropriate things...in public.
I did see a girl in a cantina in MX one time do a strip tease...really wrong! It was the dinner hours & there were lots of families all around! The waiters watched & waited until the underwear was going before they stopped her. Her friends? Laughing their heads off, Not helping her. I tried to get her to sit down and she took a swing at me... My experience is that it is usually the most inhibited sober people use the alcohol as an excuse to let go when drinking. Just my observation.
I also know of a kid who drank so much he wandered out onto the beach and died. It happens.
Be safe, don't over do. Alcohol poisoning is a real thing.
And do set up your ground rules with your friend while you are sober. Perhaps you will get this out of your system? Best to you