Depends how much you drink and what you are drinking. Best advice is to not mix the drinks i.e if you start on cider, stick to it. If you drink beer, cider, vodka and energy drinks all in the same night that's when you will feel sick!
The feeling is great once it takes effect, I find it makes me more confident and talkative. (Its true that the truth comes out when your drunk!) If you've never been drunk before it probably wont take very much for you to feel tipsy. As long as you have good mates you can drink responsibly and stay safe!