I agree with 5minutesbeforemiracle. Sexual sides are perfectly normal and expected when introducing hormone-altering medication. Sexual side effects should optimally subside within a week or two. Abstaining from p**rn and stress in the meantime can help you gauge your sexual function properly.
In my own experience, libido and sexual function dropped heavily for around 5-7 days and my body soon adjusted. If you do continue to experience side effects I would highly recommend you consider other treatments. For example, topical finasteride is proven to reduce side effects (or eliminate entirely in some cases) while having equivalent efficacy to oral finasteride. In addition, you could lower the dose of finasteride from 1mg to 0.5 mg to 0.25 mg per day. Or even take 0.25mg every other day and still get almost equivalent results to the full dosage.
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This graph shows that anything beyond ~0.25 mg will hardly change the efficacy of finasteride for you so dont be afraid to change your dosage.
It is best to consult with a doctor on the usage of male enhancement medication because they also have their own side effects if you choose to stay on finasteride while experience side effects (something Id suggest you avoid).
Conclusion: Wait 2 weeks and re-evaluate your plan. Dont be worried, your side effects will most certainly reduce. You still have plenty of options and adjustments that will allow you to use finasteride side effect-free even if they persists in the following weeks.