I have this "thing" example: if I draw 1 heart on my left leg I have to draw a second heart on my left leg or someone I love will get hurt.?

Delusional superstition OCD. You make up weird mystical situations as you mentally box yourself in with compulsive actions. Why you deliberately try to limit yourself in such a manner is curious, as it will affect your ability to get ahead and succeed in life. You will constantly hobble yourself by telling yourself that you NEED to do some silly action or another to prevent some sort of "cosmic harm" to "someone..." Such vagueness guarantees you will be able to justify in your mind that what you are doing has value, when it is actually damaging to your psyche, and your real world relationships and work experiences. You have had it for years because you somehow feel you are in control by making yourself do such things. Knowing you have a mental obsession doesn't make it better that you have one, though.

I hope you someday outgrow this self-damaging mental hindrance, and learn to just live your life without any vague mumbo jumbo about "someones..."

Obsession.