Life is a...
Well, you know the saying. But life is also one helluva party. Life isn't all good, and it isn't all bad. And even though your parents brought you to the bash, the older you get the more you must realize that it's up to you to enjoy being here, especially if you're gaining in wisdom and not just years.
That's easier said than done, of course. Life can be indescribably difficult and distressing, giving you as many reasons to acquiesce to anger, abjection, and apathy as you might find to persevere, press forth, and profit from your experiences. Regardless, the choice is yours. You can will yourself to learn and grow from even your most regrettable experiences or allow afflictions and adversities to deny you the joy of living.
You can make life richly rewarding despite how rough and rugged it can be, first and foremost, by fully embracing this present moment. And this one, too. And each moment to come. Make the most of each moment, and allow each moment to make the most of you. Yesterday is gone, and tomorrow isn't promised. So, put as much into enjoying the present as you do into building a future. Don't just contemplate life; live it. Don't just make a living; live life to the fullest on what you make. Get a life, and get the most from it.
Forsake all hope of changing the past. And don't allow yourself to be deterred, detained, or demeaned by those who dare demand that you attempt to reconstruct or restructure the past. Look to the past only to learn from it and for reasons to be grateful; not to waste precious energy trying to undo what can't be undone.
Focus on people and things that deserve your attention, and give each of them the attention that they deserve. Organize these priorities in accordance with how you perceive your purpose for living and your principles of living. Be true to yourself while treating others as well as you want to be treated and while going about the business of doing what you must to have the good things you desire.