i'm a beginner tennis player.  how many months will it take

I really want to make the tennis team but my schools team is really good. I've never played tennis until this june but i've been playing everyday this summer and I'm getting pretty good, just not good enough for the team yet. So i've made a plan that will hopefully have me at a point where i can make the jv team sophomore year.

So I play tennis competitively and I used to have a slice serve. However I stopped taking lessons because of the cost and I started playing with one of my friends who is way better than me. But now I have lost that serve but my shots are all great and my speed ws way better than before, why did this happen, is it possible to fix without a coach?

Okay, been playing tennis for about 3 years. I took it serious this past summer and increased my forehands performance ten folds. But I seemed to not have improved my backhand. In fact, i think its gotten worse. I want to know a simple technique to use to improve it. I don't want something too complex and super competitive. I currently try a one handed, and i don't have much luck. So please, it'd appreciate it.

I have really good strokes but i get really really tired. i want to improve my fitness and my footwork on my backhand side.... i cant chase balls when its on the backhand but i can hit almost every ball on the forehand. how do i improve?

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Even the freshman are better than me! I know it shouldn't make me feel less confident, but it does...I'm really sensitive and I'm really hardworking but I'm extremely nervous for this season. Please give me some advice!

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