Hey, I'm sorry to hear that you're struggling with insecurities. We've all been there. I'm not 100% secure with the way I look but I'm definitely better of now at age 21 than I was at 15 like you. What worked for me was "fake it till you make it" just fake the confidence and it might help you gain real confidence. Like I said... It worked for me!

Don't worry about getting a girlfriend right now, it'll happen, I promise. I didn't have a boyfriend until I was 19, my friend didn't have one until she was 23, don't stress about it, just be yourself and the right people will gravitate to you. It's gonna be a difficult road but you can get through it.

As for your father, I'm sorry he did that to you, you deserve better, but I'm confident you can make it through!