an 18yrold seeking guidance? quick! help him!

Question
Originally, this message was written for IRC chat, so excuse the format

Hi all! Id appreciate your expertise. I'm 18, 134lbs (60kg) 6ft 1 (185cm). 2 years ago I had 10 more lbs of athletic muscle but since lost from inactivity. I'm still active, strong, fast and agile but only because im a healthy sinewy muscle skeleton.

For the past week ive been doing interval cardio, 15lbs dumbell exercises, pull ups pushups and core workouts. My endurance is slowly increasing, but its pitiful with the weight. To get enough reps in, I lift 3-5 times a day, rest and stretch for 2 days, rotating muscle groups. Im watching my stress, and I seem to recover fine no pain or tearing.

My diet consists of salads (kale, chicory, scallions, red onions, spinach) berries (cranberries, blueberries, cherries, blackberries,  acai) fish (wild salmon, whitefish) shelfish (prawn, shrimp, crab), carbs (multigrain breads, oatmeal) .  Im not restrictive with my diet, eating out socially but I don抰 binge mcnuggets like some of my teenage friends do. I eat 3.1k calories a day, thankfully my food is cheap.

I take just for men centrum multivitamin and drink 3.5 to 4l of water a day.

I've decided to add creatine, watching my hydration and kidney fucntion (cranberries, more water).

My health is very important to me as im sure you can tell, so I research everything I do as extensivly as I can, preferably from reputed journals and publications

Better fish?
Muscle growth aiding herbs?
Should I be taking anything to shore up a hole in my diet?
Tasty crazy nutritious plants to add?

I get hungry often, just how it is. Luckily I make tasty food and enjoy eating.

Idealy, my diet is
A volume food. Something to eat when im hungry just to shut it up. Salads/ water are my go to

Energy foods. Breakfast is oatmeal for both the cholesterol help and carbs to fuel my morning. Berries berries are added for sugars and awesomeness.
1 or 2 lunches are salads, fish, carb (multigrain toast, jelly, similar)

Dinners (again 1 to 2) are lots of protein, fish shellfish, salad, beans

any advice on anything, at all (I love links to sources)?

Answer
Well, You seem to be doing many thing correctly and thats great. There are only two things that I picked out of your message that needs some further discussion.

1. only using 15 lb dumbbells

2. weight lifting 3-5 times a day

You should be changing weights and increasing weight at each set, even if this means that you need to lower the amount you are lifting. Lifting the same weight doesn't challenge the muscle. The second thing is lifting 3-5 times a day does nothing but decrease to amount of energy you have for the workout and stunts the growth of muscle. As for the vitamins you are taking I prefer to use organic vitamins. I do like your diet, very healthy. When it comes to the berries I would stay with organic if possible. The pesticides they spray on the conventional produce especially berries can hinder your workout.

Question?
How long are your workouts? I am familiar with the type of training you are doing and is there a specific reason why you train this way?  

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