I need help with OCD? Feeling dirty/suicidal almost.?

Good evening everyone. I have OCD to an extent, along with mild depression and I have a question, and also looking for some advice too. First, I just turned 20 on December 5th. Anyways, me & two friends were looking for some marijuana earlier, and one of his female friends that live in a local trailer park said she had, so we drove down and picked it up. Anyways, I now feel 'dirty' and I also feel the clothes I had on are contaminated along with the load I washed them with; are covered in 'trailer park germs'. Now before anyone throws me under a bus, I am not stuck up, nor do I look at anyone as less then me. My OCD causes me to think this way. I just don't know what to do, I feel like throwing out all my clothes and hanging myself. How do I correct OCD without a therapist? Please answer maturely. Happy holidays to you, also.