What is a good way to concentrate and relax?(I need help big time.)?

I have been thinking about this guy(kinda heartbroken.) and Idk what to do. I just need to think. but i cant figure out what is a good way to stay concentrated on it. I live with my mom and my sister. they bug me alot. I have alot of mental breakdowns because of this. I cant think straight. I just need to know. does music help? meditation? if meditation do i play music? what kinda music helps? silence? idk I need help.