You're not eating nearly enough. You're not giving your body the fuel and nutrients it needs to grow. With working out, especially for newbies, its important to do the fundamentals really well.
This means hammering out a good diet plan and kicking bad habits. Also, screw working bi's/tri's and 10 minutes of cardio won't do a whole lot unless you're doing very high intensity crossfit stuff. Do BIG compound movements. I've been at this for over 10 years and those still form the basis of my training program.
By the basic movements I mean:
1. Squats.
2. Deadlifts.
3. Bench/Bench variations.
4. Dips.
5. Chin ups/Pull ups.
6. Shoulder press/shoulder press variations.
Check out the stuff in the vault. Lotsa good info in there!