Why does my system respond to ping requests?

I have the software firewall on and in stealth mode; the online modem Firewall Setting must be at "Minimum Security (Low)" because if I use "Medium" or "High" my e-mail message center in Safari Version 5.1.5 (6534.55.3) times out. I ran GRC's Shields Up and my computer failed the "Ping reply" test. Here's the result:
Ping Reply: RECEIVED (FAILED) — Your system REPLIED to our Ping (ICMP Echo) requests, making it visible on the Internet. Most personal firewalls can be configured to block, drop, and ignore such ping requests in order to better hide systems from hackers. This is highly recommended since "Ping" is among the oldest and most common methods used to locate systems prior to further exploitation.
If this a problem that I should address what should I do. Thank you.

Thanks fane_j.Based on your answer and following your instructions step-by-step, I am definitely behind a router which does NAT although I only have a wired Westell 6100F modem connected to the computer. I use no wireless devices and I do not connect to public hotspots. I did read somewhere that GRC's ShieldsUP! firewall test tends to "exaggerate" the severity of failing the ping reply test. So, at this point, it seems that I can uncheck the Mac's firewall "Stealth Mode" setting (which appears to have been the default unless I had checked it myself at some point in time and forgotten!!) Also, should I double-check my ISP's administrative controls (that can be changed online) and look for "Discard PING requests from the WAN side" or any words to that effect or is it unecessary? Lastly, should I just leave the online Firewall Setting at "Minimum Security (Low)" (because if I use "Medium" or "High" my e-mail message center in Safari Version 5.1.5 times out)? Thanks again.

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traceroute to netflix.com (69.53.236.17), 64 hops max, 52 byte packets
1 10.0.1.1 (10.0.1.1) 1.262 ms 0.989 ms 0.701 ms
2 10.126.20.1 (10.126.20.1) 8.294 ms 7.886 ms 7.900 ms
3 209.148.243.165 (209.148.243.165) 10.543 ms 10.265 ms 11.780 ms
4 69.63.249.77 (69.63.249.77) 10.911 ms 11.223 ms 7.890 ms
5 ae0_2140-bdr04-tor.teksavvy.com (69.196.136.132) 9.884 ms
ae0_2110-bdr04-tor.teksavvy.com (69.196.136.36) 20.773 ms 10.787 ms
6 ix-0-0-2-0.tcore1.tnk-toronto.as6453.net (64.86.33.21) 10.533 ms 9.450 ms 10.983 ms
7 if-5-0-0-5.core4.tnk-toronto.as6453.net (63.243.172.25) 65.523 ms
if-0-0-0-4.core4.tnk-toronto.as6453.net (63.243.172.29) 12.200 ms 11.180 ms
8 if-0-1-2-0.tcore1.ct8-chicago.as6453.net (63.243.172.38) 25.885 ms 25.107 ms 25.536 ms
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