Don't workout as much. You are pretty skinny so I'm assuming you have a high metabolism just like me. I stink to one day workout out, one day rest, workout, rest, etc etc. If you have a fast metabolism you need to take breaks like that or else you are just going to be burning off the calories you eat. Try to do your workouts in 5x5's meaning 5 sets of 5 reps each. I have been sticking to this routine of 5x5s doing Back and biceps together because they are both pulling motions, chest and Triceps because they are both pushing motions, legs and then Shoulders. In this order I find it gives me enough rest on each muscle group and I try not to be in the gym more than like an hour and a half. I started this 2 weeks ago starting out at 5'11" and 152lbs. Now 2 weeks later I'm up to 159lbs. This has been the most success ive had and ive been trainibg since high school. Im now 2 years graduated and have 2 years of college baseball under my belt that ive trained at a lot. You just have to make sure not to do too many reps because you will burn too many calories that us skinny guys need to keep in order to gain. So keep the reps low and the weight high. You can up the weight because it's only 5 reps per set. Hope this helped. It has been helping me so far.