I know it sucks having obligations. It sucks committing to things, and it's very difficult to keep up with them.
I personally try to convince myself that it's okay to give certain things up to reduce the amount of commitments I have... And it's ultimately detrimental to growth. It's detrimental to finding new opportunities. It is one of those qualities that I just hate about myself and at the same time can't seem to shake. Most of the time I don't even realize that I am doing it. I mean I can be very persuasive in talking myself out of doing things.
The important thing to remember is that being given an opportunity to try something new is great, it could lead somewhere you don't even realize. The smallest thing could lead to a new self discovery, or a new career path, anything you say yes to could be something that changes your life forever. And yes it could lead to a dead end, or hurt you eventually but, you said yes for a reason and it's important to keep that in mind.
So stick with what you signed up for, don't stop halfway, don't give up, because you could actually find that you love something about it. You could find that this commitment was the best one you ever made. Whether it be in a relationship, in a hobby, or in a job. The only way you can prosper is through pursuing different things, and even more importantly sticking with them. Don't let your doubts get the best of you.
Don't let your own mind convince you that something won't work out. If you let all of the opportunities that you receive pass you by because of your fear to commit, well then you will find yourself completely stagnant, sitting in the same place you always have been. I think everyone wants to grow, I think everyone wants to become something more, to find their calling, to find passion, and it's important to take all of the opportunities you can to find out more about yourself.
To find out what you truly love and are willing to commit to for the rest of your life. It may be scary or aggravating or even just annoying, but commitments help you grow and as much as it stinks thinking about those obligations, you just can't run away.