hard to build muscle

I agree, it sounds like a nutrition issue to me, if you are undereating then you're not going to have the strength to push your body to do more.

In general yes people with smaller bone structure gain less muscle. However you first need to examine your diet and lifting routine. Check this out for all the info you need. Do an already written and proven routine vs one you have made up.

http://www.myfitnesspal.com/topics/show/686963-large-collection-of-info-for-beginners

Thanks for the info, I will look into that, I'm not counting caloried but eating healthy. I do more weights but can't remember the amount of weight I use. This Is also the first lifting for me. My wife is a personal trainer and she finally pulled me in the gym

OK then along with what I posted you need to track what you eat to make sure it is enough and write down your workouts. Half assed training will get you less than half assed results.

As a beginner to weight training, even if you havent built some muscle yet you should be seeing some gains from neurological adaptation alone. This is a process by which you become stronger through more efficient use of the nervous system and its connections to muscular tissues. Its one of the body's initial responses to starting resistance training.

Its common in the first six to eight weeks for beginners lifts to increase dramatically due to this effect, and perhaps some small amount of muscle gain. This is known as "newbie gains" and is followed by acute mass gains in the following weeks and months.

If you havent improved at all, something is wrong. Either you're not pushing yourself hard enough, their's a dietary deficiency or some other physiological issue. Newbies always make easy gains even if they're diet and routine isnt perfect.

Is it harder for someone small boned to build muscle. I've been lifting heavy as I can for about a month and a half, I haven't been able to up my weights. I have a small bone structure.

Bench 3 sets of 8 85lbs
Curl 15lbs
Triceps press 70
Leg press 90
Squat 60
leg extension 65

Not necessarily but it certainly limits how much muscle you can obtain. How fast you build muscle can depend on the type of exercises for hypertrophy, diet, genetics, hormones, and rest but it takes a LOT of time invested. If you get 1lb of muscle a month x12 is 12 lbs of solid muscle in a year. So it kind of puts things in perspective when you see a really big muscle guy you get a new found respect for how many years that person has invested diligently for his muscles.

Eat-Train-Sleep-Repeat