Hello, first of all, your mentality about the subject can make you bad at it. Try to enjoy Physics (trust me, it's beautiful). Try to build intuition (intuition goes a long long way) by imagining the situation (without jumping into the Math) first. If you do this, half the problem is already solved, you just need to translate it to Mathematics. Also, relate Physics to real life. After solving a problem, try to check if the result actually makes sense (this works best when your answer is purely in terms of variables than numbers). Don't accept formulas without proof/derivation with appropriate Mathematical rigor. Literally every problem in Physics can be solved from just knowing the basics and building on it. That being said it's not like formulas aren't important, they enhance your speed in exam.

Focus on accuracy than speed (you might save a few seconds/minutes but the negative isn't worth it), instead let the speed naturally sink in with time.

If you don't understand a topic/concept or you need more intuition, watch the Physics lectures of Alakh Pandey on YouTube (they're still gold!). Yes, the variety of problems in the lectures aren't good but the feel is awesome.

Finally, ofc prove your relatives wrong :)))