For anyone new to this type of pvp game:
Unless your account is maxed just take the good with the bad in pvp, but certainly don't let it ruin your mood and/or day. Learn to say GG and walk away. Do not let emotions get to you and cause more losses. If you get emotional instead of purely focusing on learning what went wrong, you're going to lose.
In pvp you will have to make a well balanced deck specifically for pvp. Specifically to accomplish certain tasks. What's your win condition? How will you protect that win condition? If your win condition gets interrupted, how will you respond? Will you throw away bad trades, or regroup for the main objective?
Will you recognize decks and/or minis that hard counter you? How will you play in those battles? Will you think outside the box and trick them with something unexpected?
They are taking the high ground, are you going to go low and just eat their casters DMG from above for no reason?
Will you play with absolutely perfect placement? One wrong placement can cost you the entire game
Will you track WHY you lost a game and learn from it?
Will you recognize when they have their total win condition steamrolling at you? Will you understand the most efficient way for your deck to dissect that push?
What will you do to deny them gold? What will you do to dominate the gold gains?
List goes on and on. Endless questions here.
Pvp decks will NOT be pve decks. If you queue with a pve deck you're going to have a bad time. Every day that passes people are learning, and the gap between pve decks and pvp decks grows wider.
Pvp will only become more difficult as the days pass. You will get crushed. People will know what kills what, and what doesn't, etc. people will be brutally efficient and it will absolutely suck if you aren't on the same page.
I don't have a dog in this fight. I'm burnt out on pvp from 7 years of top level clash Royale gameplay. Maybe I'll come around one day, but I'm mostly here to watch high lvl pvp, not play it myself. But yea, if you played clash Royale you will have a huge upper hand vs people who didn't. The pve in this game has been so refreshing for me.
Hope this helps
Have fun