do I have ocd??

i just installed this app so i dont really know what im doing, but if you see this please reply: do i have ocd? when i was younger, i believe i had ocd, due to me have to do things a certain number of times, for example when i got in a car i would have to tap the chair in front of me at least 4(or an even amount) times or else i was just feel..incomplete? i dont know the name for this feeling, but it is very stressful. there were many others things i had to do like this. then after awhile this symptom went away until this past 2 years, but it is much worse. i still do the thing where i have to do things a certain amount of times, but now i also am just really afraid of things being out of order, not necessarily messy, but in a place which i dont rmeber where it is, and i dont trust my self if i did something, for example shutting a door behind me, i have to look back like 3 times to make sure i actually did it even thought i definitely did, but i just have to make sure or else i have the feeling of being incomplete. sometimes i have to shut jt over and over again. i make sure i do these little things such as putting one coin in my pocket everyday and if i forget it so stressful to me to the point of tears and breakdowns. this stuff makes me extremly stressed and sometimes i have to go back to harming myself to relieve this feeling, which isnt good, but its like the only thing i can do to solve it. there are many more things that i do that i think is ocd but the paragraph already long so just please let me know if this is ocd?