If you honestly give your best effort, and you fall short, then the problem is not with you. You can only ever give your best effort. You may have a moment where you feel emotionally volatile and this may affect how you do things. That doesn't mean you are not giving your best effort. It may just not turn out as good as it might under ideal circumstances.
This is part of the human condition. Being able to accept our own human nature is integral to the concept of acceptance. If we have unrealistic views about how we should be, if we let other people set those standards, or if we base our ideas on only the successes of others, then it is no wonder if we cannot meet those expectations. Those expectations are simply not based in reality.

If you are unsure about something or someone, just wait. Patiently wait and see. Don't commit yourself to a point of jeopardy. Don't take an unnecessary risk. Only assume risk that you are prepared to lose. Don't place expectations and don't attach to outcome. Just go with the flow. Ride it out a bit. I am a firm believer that time speaks all truths. In time, the truth of any matter is always revealed. If you trust yourself and trust yourself in something then you will always come out the other end OK. We have to be self-aware as to what our triggers are. Where are we vulnerable. We have to work with all facets of our personalities. It is then, when we can trust ourselves in any and all situations. Yes, we will still make mistakes. But we will not make as many unnecessary mistakes. I see a lot of people who are very volatile because they shy away from their perceived weaknesses and vulnerabilities. I can't stress enough how important it is to face yourself head on. Work with whoever and however you are. It will give you great great strength. Then you can rejoice at any good outcome and you can dust yourself off from any bad outcome. Remember, you have survived thus far. You're a fighter, a warrior. You're so strong! Always believe in yourself!

If you don't like the output, change the input. If things are not going the way you hoped, change how you do things. Don't be afraid to try something different. Don't be afraid to try something new. At the very least you will learn. That learning in and of itself is invaluable. Don't be discouraged if things don't work the way for you as they do for others. Just keep adjusting until you find your solution. Don't give up. Keep believing in yourself. Have faith. Have the courage to keep trying.

When you expect nothing and receive something, it's such a nice surprise. I'm not saying to be pessimistic. Just when it comes to other people, don't hinge your happiness to expectation and outcome. Don't make it tit for tat. Don't keep score. Don't expect or demand something back. Do the best you can. Work passionately towards your dreams. Be a good person. Liberate yourself from expectation so much that when something does happen: when someone does do something nice, you can be surprised. Celebrate in that joy. It makes it all the more fun when it comes unexpectedly! Expectations in relationships suck all the gratitude and appreciation out of everything. Beyond honesty, respect and basic decency nothing need be "expected". Let it occur naturally. Go with the flow. Whatever you end up with will be more honest and real.

It is OK to take a break. Sometimes we want something so much that we diligently give effort towards it day after day after day. When you feel tired, remember to not guilt yourself over taking a break. It is OK. You can pick up where you left off tomorrow. Ask for help if you can. Exercise some self-care. Look after your own needs. Love yourself. Be kind and generous towards yourself. Remind yourself as to why you are important. Refresh and recharge your spirit.

Unhappiness is not an excuse for rude, obnoxious, reckless and destructive behavior. We have a responsibility to one another. We have a responsibility to add good, not bad, to the world. Everyone suffers. Don't be the cause of someone else's suffering. Where is the empathy? Start acting with love. Be compassionate, be kind, be all those things you wish others to be. Be an example. Confront your unhappiness. Find and use the help you require. Don't be afraid to ask for help. Reach out.