That's life, isn't it? We all have to show ourselves in a good light if we want people to like us.
I'm married (met my wife online as a booty call/hookup), but the main lesson I remember from online dating was from the woman who commented, "...you don't sound at all desperate." I didn't understand, so after we met, she showed me a sample of messages she got from guys and I couldn't believe how absolutely awful they all came across. Other women since that verified the same thing: 99% of men they met online seemed like losers at first glance so they just hit <delete> and moved on.
Basically, sound like a friendly person with a sense of humor and you're way ahead of 90% of the rest of people looking for love & sex online.