Energy Control

For the last few months, it's been really hard trying to keep my aura and energy level at a "norm", but at my school, there's so much negative and unusual energy that I can't keep it out. When I absorb too much of their energy (unintentionally, by the way), it causes mine to "burst out" and radiate over everyone around me. I become angry, moody, or depressed and sometimes I even obtain an "energy high". I tried putting shield s up, but with all the noise, my shields are weak and only last for a few minutes. When I try to make my shield stronger, it just drains me and I lose my focus. I need help. How do I maintain a "normal" energy level without draining myself in the process? Sometimes, I give my energy to help someone else, but I always gain energy back. Other times, I use my energy to move people away from me. That doesn't drain me as much, but I do lose a little energy. At night when the moon can be seen (in any phase except new moon), it gives me energy to absorb and regain my strength. When I'm in my own "zone", I tend to let my guard down and just meditate on what I"m doing or what I'm about to do. I also need help with creating better energy shields. If you any advice on that, I'd really appreciate it. I'm hoping I can get this energy absorption down, or I fear that something or someone going to get hurt.