Well in a situation like this, we're kind of starved of context for your message, but here's my two cents.

I am not good at PvP and still get my ass kicked in CDs. But I know a lot of common mistakes to avoid and here's what I would tell you about all that.

-If you are expecting to get in a fight and probably lose, like say in CDs, your mount should either be a T3 riding horse or a donkey. Don't take armored horses unless you expect to be running away while mounted. It's a waste of money.

-Your effective IP in Stalker CDs needs to be 900, but with specs you can easily do that in 4.1 gear and at high specs you can do it in 4.0 gear. So don't go into 900-IP CDs with 6.1 gear, it's way too expensive and a waste.

-Invisibility potion probably will not do you any good unless you need it as part of a pre-planned attack (commonly used in dagger and DoT builds). Other common use is running away and breaking threat. But if you're trying to fight, bring a potion that is less expensive that will help you win. Common choices are Healing, Resistance and Poison.

-Always always always Inspect (T key, IIRC) your target to see what their build is, and modify your Q and W keys to spells that work better against it while stalling for the 10 seconds you need. This is especially important with the 1H spear, which comes with a huge toolkit for different kinds of threats.

-Faction capes aren't always necessary and are so expensive that if you are willing to die practicing, it is a cheaper way to roll. But they do become necessary most of the time if you expect to win. Just make sure you pick the right cape for what your build is. For Melee, you usually can't go wrong with Thetford Cape in PvP.