What Are The Chances Of STDs Through Contact With Inanimate Objects?

Question : Hello Doctor,

Firs of all, I always wipe my penis with toilet paper after having pee, so I went to a public bathroom and had a pee. So I used the toilet paper which was over the dispenser, so I wiped my penis with it; then, I realized that paper was wet, so when I unfolded the paper I saw the sputum. Then, I immediately washed and cleaned my penis with shampoo, but it is important to say that I cleaned my penis with cleaned layer of the tissue, which had sputum inside it that is why I did not see. Hypotthetecly, lets say that was fluid or saliva. So my question is that:
Am I exposed of Hiv?
AM I exposed of Any STD?
please explain for me doctor because I am so depressed and worry.

Thank you very much Doctor for responding!

Doctor I was stupid, I picked up the toilet paper over the dispenser. So I thought someone has put on it without using. So I have unfolded the paper after feeling a wet inside the paper. So I have found the sputum. But it looked like that would be for more than 12 our because it was kind of old; I guess.
however, I have cleaned and washed my penis with shampoo less than a minute after noticing that.
So what do you think about that please?
Dear Doctor,

Also, I forgot to tell you that I also used black oil and Tea Tree directly after washing with shampoo that was less than a minute after using the paper.

I am terrified so please if you can explain if there is any possibility ?

I really appreciate for your detailed responding in advance!