str8 boy asked to cam by a another boy?

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i am a 16 yr old boy. i was online and on fb when another boy about my age befriended me. then asked if i wanted to cam with him and talk to him face to face . i said ok. when we cammed he was sitting there naked. suprised me at first but i went along. then later he strated to get a little hard. he saw me looking and asked if i wanted to jerk off with him. i said i had to go but maybe another time. what should i do? im a little interested just because its something ive never done before. but i am str8. should i do it? is it normal? what do u think?