plz help urgent

[lpko]

hey everyone.
so here s my story:
for 4 years now i have had family problems,from money,casino,to a constant fight with a brother for several years.i used to be a very sociable,lovable person in my origin country,but i moved to canada.i dont have but 2,3 actual friends,im exetremely lonely,unsociable,except with the ones i already know.i cant make friends with new people.i spend most of my days home,playing on tv.i think alot,and by alot i mean exetremely alot,until my head hurts everyday.i mostly think about bad experiences that happened to me in my life,i tend to remember my worst memories,im 18 years old.i have alot of stress,like im holding everyones problems on my shoulders,and all this thinking is causing me abdominal pains,and excessive gaz,which isolated me more that i am already.i also have this thing,i win over it usually but when its about physical health its hard to beat it::its like im sorry to talk about it here but here we go:i watch porn,so once i masturbated, and 3 days later i masturbated again,and the 4rth day i masturbated too.so the problem is the 4rth day i had little minime pain while ejaculating,but that think got bigger in my head.so now,something in my fucking head tells me,hey,what if each time you masturbate after 3 days,and on the forth you will definatly have pain.plz dont laugh at me i know its illogical,naive,depressive.....but it gets worse,few weeks after,i say to myself:you know what,maybe it was 4 days after,or even 5 days ,or even 6 days,so now i have to try all these options,which takes weeks,just to assure myself there is nothing wrong with me and that the pain isnt chronological.i know its absurd but something keeps following me in my head.telling me,maybe your wrong.....and i keep fighting it for days.
there is alot of other examples but i tend to forget them cause unimportant.
so plz someone help me.