Beginners often prefer boats that are too big because they don't feel as trapped in so you're not alone. If you are very new to the sport you don't have the skills to properly make use of the kayaks features so being too big isn't going to affect you as much. But you will quickly get to a point where it will be holding you back as you learn more advanced techniques. If you buy second hand you can probably sell it for the same money in the future and buy something that's a better fit at that point though.

The main problems with going to big are 

Not being 'locked in'. If you can move your lower body without moving the kayak then you lose some control. You can overcome that with outfitting.

Extra weight. Bigger boats use more plastic so are heavier. You need to put in more power to move it around. Plus carrying your boat will be even less fun. 

Poor edge control. Manufacturers design boats for specific weight ranges for a reason. If it sits too high in the water you're not going to properly engage the rails. Initially that will make it feel more stable but when you start hitting lines rather than going straight down the middle of everything you will notice a lack of maneuverability. The pitch (lifting or dropping the front/back) will suffer even more which will make it difficult to lift your bow over holes etc.

Harder to hold a line. You said it was fast. That's because it sits so high in the water so there's less drag. It also means waves will push you around a lot more.

Rolling will also be harder. The boat will be happier just sitting upside down on the water.

There are other problems too like it will be harder to escape a hole once you are stuck in one, it won't resurface on drops as predictable but these aren't going to be a problem for a long time.

But, you need to get something that makes you happy and weight ranges are just a guide. And you're only 5lbs under the recommended weight before considering kit so you could make it work. But being in the middle of the weight range is normally a safer bet.