Stop taking so much notice of how you feel. How you feel is how you feel. It'll pass soon. What you're thinking is what you're thinking. It'll go too. Tell yourself that whatever you feel, you feel; what ever you think, you think. since you can't stop yourself thinking , or prevent emotions from arising in your mind, it makes no sense to be proud or ashamed of either. Only your actions are directly under your control. They're the only proper cause of pleasure or shame.
Let go of worrying, it often makes things worse. When you are hair trigger primed to notice the first sign of trouble, you'll surely find something close enough to convince yourself it'll come.
Ease up on the internal life commentary. If you want to be happy, stop telling yourself you're miserable. People are always telling themselves how they feel, what they're thinking, what others feel about them, what this or that even really means. Most of it is imagination. Whatever you tell yourself will be make-believe.
Take no notice of your inner critic. Judging yourself is pointless. Judging others is half-witted. Whatever you achieve, someone else will always do better. However bad you are, others are worse. Since you can tell neither what's best nor what's worst, how can you place yourself correctly between them? Judging others is foolish since you cannot know all the facts, cannot create a reliable or objective scale, have no means of know whether your criteria matches anyone else's, and cannot have more than a limited and extremely partial view of the other person.
Give up on feeling guilty. Guilt changes nothing. It may make you feel you're accepting responsibility, but it can't produce anything new in your life. If you feel guilty about something you're done, either do something to put it right or accept you screwed up and try not to do so again. Then let it go. If you're feeling guilty about what someone else did, see a counsellor.
Stop being concerned about what the rest of the world says about you. Nasty people can't make you mad. Nice people can't make you happy. Event or people are simply events or people. They can't make you anything. You have to do that for yourself.
Don't be concerned that your life and career are not working the way you planned. The world changes constantly. However carefully you analyzed the situation when you made the plan, if it's more than a few days old, things will already different. After a month, they'll be very different. After a year, virtually nothing will be the same as it was when you started. Throw the plan away and keep your eyes on reality.
Don't let others use you to avoid being responsible for their own decisions. To hold yourself responsible for someone else's success and happiness demeans them and proves you've lost the plot: It's their life. They have to live it.
Don't worry about your personality. You don't really have one. Personality, like ego, is a concept invented by your mind. It doesn't exist in the real world. Personality is a word for the general impression that you give through your words and actions. If your personality isn't likeable today, don't worry. If you don't like the way you are make yourself different. You're the only person who stands in your way.
Don't have unprotected sex, ever. Disease, unwanted pregnancies, and a lifetime of serious consequences for a few moments of enhanced pleasure, to name a few possible consequences.