Can I press charges with no evidence? How?

This story starts out innocent enough.. I go to school with his daughter, stepdaughter. We are both the same age. He must have seen me around the school I guess. He has a younger son and I have a younger sister. The younger son was having a party and I was invited to take my sister. I was 14 at this time. I was introduced to the husband and it's a blur in my mind As to who he was. A few weeks later, he messages me on Facebook asking if I want him to buy anything for me. I had no clue who it was, no Facebook picture or anything. Kind of just ******* around I would message back the random Facebooker when I was bored. I wanted these extensions at the time so I asked for them. But never told specifics. I stopped talking to The Facebooker. Then 2 weeks later received a call. He said you don't know who this is but I saw you at a party the other weekend. He confessed that he was the father of my friend. Young and stupid I continued to have small chat with him until 16. So he was grooming me. Sense I was 14 pretty much. Anyways at 16, I go over his house in his son’s room he gets me drunk he’s aggressive and I say no but eventually I’m just scared and go along with it. I don’t want to say rape in court because then they'll ask why I didn't go to the police. And the truth is I’m embarrassed. I look back now like how sick was I. But I’m now 17 I want to press charges. By the way, he’s like 43. I don’t want this to happen to anyone else which is why I’m doing this. Also I hope he’s not raping the girl I go to school with as well. How do you think I can win this case? I am thinking about just give me a honest testimony and that's it. I am scared that sense it happened last year and I’m now 17 they’ll throw it out.