Also remember, instead of envying others for things you don't have, ask God to give you the desires of your heart. God is the the source of all good things. If He doesn't give you something, it's either because:
(1). your motives are wrong or
(2). it's for your own good.
God never withholds anything which is good for us.
I remember in the past when I've been insulted by people for not having certain luxuries (ex. smartphone, car, etc.) and also regarding why I didn't have a social media account on sites like Facebook. I've learned that such people are stupid. They are narcissistic sociopaths. They will insult you and try to get under your skin based on the weaknesses they try to find in you, all in order to elevate themselves (they like standing on top at the expense of others). If you happen to get something good which they get envious of, then they will turn against you and still insult you. That's why you can't win with such people. As soon as you see them as the narcissistic sociopathic type, just smile and stay away from them. They are mental! You can laugh to yourself regarding that (seeing a mental person trying to get under your skin). Couple of important lessons God has taught me regarding temptations and envy are (refer to Matthew 18:6-9):
(1). If you are prone to getting envious easily, don't look at what other people have. This is one of the reasons why I don't use social media anymore as it's a form of self-advertisement and bragging which pulls you in (you will develop the tendency to try and fit in with everyone else and in the process become a narcissist yourself). Thus, cut off such sources from your life. When you step outside, learn to look away when you see something you covet. Learn instead to thank God for everything He's given you so far, even though it may not compare to what others have. Remember that God always gives you the best and whatever you need during a particular time period. He may make you wait before you receive more things. That's a good thing and many times we fail to look for the hidden blessings behind what we lack. Learn to develop that practice of looking for hidden blessings.
(2). Don't be the source of envy by being a narcissist who advertises yourself on social media and everywhere else (ex. school, college, church, workplace, etc.). Just stay humble and don't try to show off. You know how it feels to be envious, hence don't cause someone else to become envious of you by showing off (in other words, don't cause someone else to sin because of your bragging). This is another reason why I don't have a social media account on sites like Facebook. Even on this blog, I've made sure to not try to brag about anything. Try to live a simple/minimalist lifestyle.
James 4:1-3 (NLT):
"What is causing the quarrels and fights among you? Don’t they come from the evil desires at war within you? 2 You want what you don’t have, so you scheme and kill to get it. You are jealous of what others have, but you can’t get it, so you fight and wage war to take it away from them. Yet you don’t have what you want because you don’t ask God for it. 3 And even when you ask, you don’t get it because your motives are all wrong—you want only what will give you pleasure."
James 1:17 (NLT):
"Whatever is good and perfect is a gift coming down to us from God our Father, who created all the lights in the heavens. He never changes or casts a shifting shadow."
Psalm 84:11 (NLT):
"For the Lord God is our sun and our shield.
He gives us grace and glory.
The Lord will withhold no good thing
from those who do what is right."
It's frustrating to see evil people prosper (especially carnal Christians who then bully you). However, remember that God has promised that He show you His goodness also (refer to Matthew 5:45). It's hard to understand the logic in why God allows that (you'd expect God to punish them because He punishes His children when they sin). One thing for sure is that their prosperity and sociopathic behavior is only temporarily allowed. God is kind to such people so that they will see His kindness and come to repentance. If they don't repent, then they force God's hand to send them into eternal destruction (refer to Psalm 73:12-28 and Romans 2:4).