I'm confused about what causes suffering: pleasure seeking or sin? Drinking coffee causes me suffering (I'm quitting smoking). But it's not a sin. I'm not really even sure what sins are?
The best advice any of us can give is "walk in the Spirit, not in the flesh." If you are walking with God, He will help you understand if you are doing wrong and then stop it, ask forgiveness, and don't do it again! Sometimes, some of us are a little more hardheaded and it takes a few go arounds of that cycle (and the pain associated with it) to learn.
I would suggest not worrying so much about the negative, but on the positive. For instance:
You can think of your walk with God as a minefield where you don't even know if you may be sinning and booom--you're done.
Or you can think you are walking in a relationship with God and He is guiding you through that minefield of things that can damage your life and the life of others around you. So, it is in everyone's best interests that you follow Him as closely as possible--not by following a written set of rules, but by listening when He speaks. If God tells you not do something and you do it, it is sin; so don't. If God tells you to do something and you don't, it is sin; so do it. If your conscience convicts you and you do it anyway, you are sinning; so stop! According to Scripture, anything not done in faith is sin; so, if in doubt, don't do it! Why? Because Daddy knows best and wants the best for us and those around us!
For instance, drinking caffeine (a drug) may not be a sin for everyone. But, for me, it is; because God explicitly told me not to do it. You would think, because I love God, that the first time He told me that I would completely give up caffeine forever and ever. Yep, you would think. But, when the pressures of what I was doing on a daily basis convinced me that I needed caffeine to function, I justified my sin. God get me prove the damage to myself and I eventually was able to weed it back out. You would think I learned my lesson. But, noooooooo! Another situation arose where I felt like I just needed the extra boost. Again, I crossed the bounds that God had given me, rationalizing/justifying that God put me in the situation and had to know I would need the extra energy. And, bam! I just did it to myself again. This is like the 3rd time in about 16 years of walking with him that I have had to overcome caffeine! But, God is patient with me and I am hoping this is the last time He has to re-teach me on this topic, because that willful choice I make affects other things in my walk with God and my temporal life here that I don't want or need to have affected negatively.