Idk how many truly competitive guilds will accept a level 18. Likewise, how active can you realistically be if you're that low level? To put it in perspective, I have 140,000 battle points THIS MONTH where as you have less than 5,000 battle points in total. I'm not at all trying to rain on your parade. I simply suggest to you from experienced player to new player that you focus on leveling up right now so you're more presentable to better guilds. When you better yourself you'll become more in demand but level 18 players are a dime a dozen.
A guild doesn't make you stronger. the stregth is allready in you we just nead to bring it out. the only thing they can do for you is give you knowledge that is were the real power is. so don't be so harsh on the guy if you take them under your wing then you can give them that necessary knowledge to be greater.