Okay I'm 21 and lately has been oily and greasy, it never used to be this way, I had good skin all my life, and I feel like keep washing it all the time, what is going on and what do I have to do

Have you thought about maybe you've been washing it too much? Or, if you wear makeup, have you switched make ups?

I'd try an oil control cleanser, just use it once in the morning, and once at night. And an oil free moisturizer.

The thing is that the only makeup I wear on my face is eye liner and I don't ever usually wear it, I don't usually wash my face but I'm going to have to purchase the stuff

I know it doesn't seem like it now, but consider it a blessing. The oils in your skin will keep you looking younger longer.

I had this problem in my 20s as well. Now, more than 20 years later, I look like I am in my early thirties rather than the 45 that I really am.