First time with my boyfriend

So I'm 15 and last May my boyfriend of a year moved to Florida. The day he left was easily the worst day of my life. We know about the whole long distance never works stuff but it's not hard to stay together. In fact it's the exact opposite. It's hard to stay apart. We can't not be together. Anyway, I'm completely in love with him and he is with me. I'm going to visit him at Christmas and we've planned to have sex for the first time then. My only problem is my moms against the pill so I'm not on it and I'm a little paranoid that a condom won't be enough. Am i just being paranoid?