Hmm... this one hits home for me. I am usually quite shy and a little awkward when people first meet me irl so it was tough for me to make friends quickly in school like other people could. I have never really introduced myself to others first with the intention of being friends because as chipper and lively as I may be online, I am definitely not super confident or anything in person. I'd describe myself as quirky, sarcastic, and talkative to those close to me, and polite and quiet to those who don't.
In your scenario, I would probably portray myself as a jokester because it is close to how I am when I am with people who actually know me. I don't really see the point in hiding my true self just to make people like me and it is an empty existence for me if I do that. But if I was lonely and wanted to make some conversation with others, this is how I would do it instead of hiding away behind my phone. In 1st year (freshman year in high school), it would take a lot of courage for me to speak out but as I grew older and went to college, I just became more content to pick who I talk to carefully and toe the line of how much of my personality should come out. It is natural to be "different" around different friends, but the way you portray yourself should still be true to who you are - just to varying degrees. No one is going to like you 100%, but it's those who can like you despite the things that they don't like that are worth keeping in your life. Does what I just typed even make sense? Maybe... maybe not. Well. I typed it all out soooooooo I will just leave it here. Yep. ^^;