Well, no your not, my 3 were around 35, 40 when I was there. Keep on going, you don't need a big team even late on in the game, mine defeated Team Rocket easily.
I beat Clair and went to the Dragon's Den to take the test to get the badge, I'm currently looking for my Skarmory, as well as getting apricots? to make custom pokeballs and going back around the Pokemon world to find all the other secrets needing HM's like strength, surf, and waterfall. I managed to catch Ho-Oh, but it wasn't easy, it was in the very low red and was paralyzed and it still took a while. I also managed to get Entei and Raikou to this, hopefully I'll be able to catch them soon. Before going to the E4, I'm going to max out my PokeDex from what pokemon I can get before fighting the E4, and evolving them. This'll also help me with my 3 remaining spots open for my team. Currently typing this post, I'm exploring more of the Ruins of Alph. Hopefully I'll find more rare candies than I already have. (3 I think)
Team so far
Lv.46 Feraligatr
Lv.46 Ampharos
Lv.45 Togetic
NOTE: To all those who don't know, unlike in Gold and Silver, you have to wait until after passing the Dragon's Den test before you can get your respective pokemon in HG/SS because after you get out.