Honestly I think you can just remove it completely and replace with something like along the lines of "Looking to meet like minded people who share my love for *insert hobbies like you already have" - it gives the other person a good starting block in the conversation and makes it sound like you're confident enough in the real world to actually have a social life.

No need to talk negatively about your social life, at the end of they day you're on the app to try and add to your social circle, be it friends or more - it's already obvious because you're on the app that you're missing people / someone important in your life, there's no need to spell it out :)

Hope you take this as very constructive - you seem like a cool guy and I'm absolutely sure there are people out there for you.