I'm A 17 Y/o Male And I Have Been Having

I'm a 17 y/o male and I have been having trouble with my sperm or lack thereof. I can get up fine and orgasm fine but unless I wait days between ejaculating the sperm is not normal. Sometimes no sperm is produced, sometimes very little, sometimes it is very little but it's very thick with almost no transparency anywhere. I began masturbating very young (around 7, don't ask why) so that could have possible developmental effects maybe?