Most of the population of everquest is high-end characters...60+. So a level 15 cleric is still a very low level character. Dont worry though. The reason most people are high end is because one they have been playing forever, and two, its pretty easy to get a character leveled up relitivly high in a short amount of time, you shoudn't have too much problem getting to 40 in the next couple of weeks of playing.
The problem your facing is that being a cleric, your not the best solo class out there. Go to paudal caverns at 15, untill things con LB to you, around 20 or so if i remember right. Then i would hit up maurs seru, and then DSP, dawn shroud peaks, then the Overthere. IF you just go to these zones, there will prolly be someone there PLing their alt toon or a group who already knew about the zones leveling there. I would get to 40 before i start worrying about not finding a group.
The new expansion Depths of Darkhallow was made just for a person in your situation it seems. The monster missions are available to anyone from 1 - 70. That is defintally where you will find the easiest group now days. I can log on, go to nek forest, /ooc LF MM no timer, and have an invite in less than 15 seconds, or start my own group and have it filled and ready in less than 5 min. I would defintally look into buying that expansion if you have not already. BUT, you dont play as your cleric with MM's so beware, your not learning how to play your class like that.
Im not on stormm server so i dont know about guilds on that server. look on eqrankings and other sites to find guilds on your server. /ooc when your in pok that your a low level player looking for a grouping guild. It shouldn't be too hard to find a guild, at the level, at all.
well i gotta get back to work, GL and dont get discouraged, this game isn't easy!