It depends on whether you are planning to play chess professionally.
If you do, you should try to improve your chess, but not because of your parents' desire but because chess will be an important part of your future. You should treat chess as a professional treats his job, in addition to playing chess for fun.
If you are going not to be a professional chess player, but you are going to have different education and have a different work, chess will inevitably somewhen become less important to you, it will become a hobby to spend some time on. In such case, you should play chess as far as it is pleasant, even if you don't perform well, because a win at a tournament will not benefit you much if it is connected with tension, tiredness, and other unpleasant emotions.
So, to start this out I have been playing chess for around 7 years, ever since I was around 6 or 7. When i first started playing tournaments, I found the experience fun and challenging as I did well in the few amateur ones I played and my rating went up to around 1000. However, as I reached the beginning of elementary school, my rating became deadlocked at around 1200. For a year or more, my rating stayed at 1200, much to the chagrin of my parents. You see, at the beginning of my chess career, they ignored my chess failures and encouraged me to keep playing, but at this time, they began to get aggravated with my lack of improvement, and it got to the point where after a bad tournament they would scream at me and tell me I was awful, etc. Well, naturally, I began to hate chess tournaments and the game itself.
Through middle school, I clawed my way up to around 1700 with my parents pressuring me each step, severely chastising me when I underperformed at a tournament. Now, finally, I have reached high school, and once again my rating is at a standstill. I have dropped 100 points in the past year and my parents are, needless to say, not amused. What they don't understand, however, is that in high school, with a ridiculously tough schedule, I no longer have time for chess, yet they still expect leaps and bounds in my chess rating. Every chess tournament I play is full of extreme nervousness and tension over what will happen should I underperform, which inevitably leads to me screwing up in some manner and ironically, underperforming. Due to my parents' involvement in my chess situation, I now despise chess tournaments with all my being, though I am still quite fond of the game itself.
tl;dr Question: If I have overbearing parents who scream at me every time I fail a tournament which, in turn causes me to screw up more tournaments due to overwhelming nervousness, how should I deal with these problems to overall play a better game of chess at later tournaments? Help soon would be appreciated as I have a tournament Saturday =/
Thanks!