Worried about what

I'm a 21 year old guy who wears his heart very clearly on his sleeve and to that effect I tend to love very openly and deeply and passionately. I've recently just broken up from my first real and very serious girlfriend - I loved her so much and I still do, it wasn't really my choice to break up but it was because of what I did that caused us to split. I'm terrified that I've ruined my only chance of love as stupid as that sounds since I know I'm still so young but I can't help but feel that way! The way I felt about my ex was so real and I was ridiculously happy and now that she's gone I'm completely lost and terrified of the future. I just want to know that I haven't let my one chance of love slip away.