I can't help but masturbate when ever I'm alone or when I get my chance is that bad

Excessive, yes.
Probable explains the lump you found.

No. It's perfectly normal, especially at your age when hormones are going crazy inside you.

***ADDED*** Like Ben said, excessive is not good. Be sure you spend time in sports and happily doing chores at home and doing well in school and with homework.

I do all that I'm on the basketball and football team and that might be true ben